Compositions for the oxidation dyeing of keratinous fibers comprising at least one coupler, and dyeing methods

A composition for oxidation dyeing keratinous fibers comprising, in a medium suitable for dyeing:

• (a) at least one oxidation base;
• and
• (b) at least one coupler chosen from compounds of formula (I) and acid addition salts thereof:
• wherein:
• R1 is chosen from:
• a hydrogen atom;
• a Group A1, wherein said Group A1 is chosen from a hydroxyl group, a dimethylamino group, and linear and branched C1-C8 alkyl groups optionally unsaturated and optionally substituted with at least one unit chosen from:
• a group A2, A4, or A5 as defined below;
• one or two groups, which are identical or different, chosen from N—(C1-C3)alkylamino, N—(C1-C3)alkyl-N—(C1-C3)alkylamino, (C1-C6)alkoxy, oxo, alkoxycarbonyl, acyloxy, amide, acylamino, ureyl, sulphoxy, sulphonyl, sulphonamido, sulphonylamino, bromo, cyano, amino, and carboxyl;
• and one or more groups chosen from a hydroxyl group, a fluoro group, and chloro;
• a Group A2, wherein said Group A2 is an aromatic group is chosen from a phenyl group, and a naphthyl group, wherein said aromatic group optionally substituted with one to three groups, which are identical or different, chosen from methyl, trifluoromethyl, ethyl, isopropyl, butyl, pentyl, fluoro, chloro, bromo, methoxy, trifluoromethoxy, ethoxy, propyloxy, acetyloxy, acetyl, amino, oxy, and cyano;
• a Group A3, wherein said Group A3 is a heteroaromatic group chosen from furanyl, thiophenyl, pyrrolyl, imidazolyl, thiazolyl, oxazolyl, 1,2,3-triazolyl, 1,2,4-triazolyl, isoxazolyl, isothiazolyl, pyrazolyl, pyrazolotriazolyl, pyrazoloimidazolyl, pyrrolotriazolyl, pyrazolopyrimidyl, pyrazolopyridyl, pyridyl, pyrimidyl, benzoimidazolyl, benzoxazolyl, benzothiazolyl, indolyl, indolidinyl, isoindolyl, indazolyl, benzotriazolyl, quinolinyl, benzoimidazolyl and benzopyrimidyl, wherein said heteroaromatic group is optionally substituted with 1 to 3 groups chosen from linear and branched C1-C4 alkyl groups, a C1-C4 monohydroxyalkyl group, a C2-C4 polyhydroxyalkyl group, a carboxyl group, an alkoxycarbonyl group, an amido group, an amino group, a hydroxyl group, and a halogen atom;
• a Group A4 is a group chosen from C3-C7 cycloalkyl and norbornyl;
• wherein said C3-C7 cycloalkyl group and said norbornyl group further comprise at least one double bond, and wherein said C3-C7 cycloalkyl group and said norbornyl group are optionally substituted with 1 or 2 units chosen from linear and branched C1-C4 alkyl groups, a C1-C4 monohydroxyalkyl group, a C2-C4 polyhydroxyalkyl group, a carboxyl group, an alkoxycarbonyl group, an amido group, an amino group, a hydroxyl group, an oxy group, and a halogen atom;
• and
• a Group A5, wherein said Group A5 is a heterocycle chosen from dihydrofuranyl, tetrahydrofuranyl, butyrolactonyl, dihydrothiophenyl, tetrahydrothiophenyl, tetrahydrothiophenonyl iminothiolane, dihydropyrrolyl, pyrrolidinyl, pyrrolidinonyl, imidazolidinonyl, imidazolidinethionyl, oxazolidinyl, oxazolidinonyl, oxazolanethione, thiazolidinyl, isothiazolonyl, mercaptothiazolinyl, pyrazolidinonyl, iminothiolane, dioxolanyl, pentalactone, dioxanyl, dihydropyridinyl, piperidinyl, pentalactam, morpholinyl, pyrazoli(di)nyl, pyrimi(di)nyl, pyrazinyl, piperazinyl, and azepinyl;
• provided that when R1 is chosen from Groups A1, A2, A3, A4, and A5, R1 is optionally attached to the nitrogen at the 7-position by way of a group —(CO)—;
• X is chosen from groups OR5 and NR6R7, wherein
• R5 is chosen from linear and branched, saturated and unsaturated groups comprising from 1-20 carbon atoms, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched groups optionally forms at least one 3- to 7-membered ring comprising at least one carbon atom, with the proviso that:
• (i) said R5 does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• R6 and R7, which are identical or different, are each chosen from a hydrogen atom, linear and branched, saturated and unsaturated groups comprising from 1-20 carbon atoms, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched groups optionally forms at least one 3- to 7-membered ring comprising at least one carbon atom, with the proviso that:
• (i) both said R6 and R7 do not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group, and
• said R6 and R7 optionally form a ring chosen from a saturated and an unsaturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R, wherein
• R is chosen from linear, branched, saturated, and unsaturated, C1-C6 a alkyl groups, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched C1-C6 alkyl group optionally forms at least one saturated or unsaturated 3- to 6-membered ring;
• with the proviso that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• wherein
• said R1 and said R5 optionally form a ring chosen from a saturated and an unsaturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the proviso that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• and
• said R1 and said R6 optionally form a ring, chosen from a saturated and an unsaturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the proviso that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• R2, R3, and R4, which are identical or different, are each chosen from a hydrogen atom, a halogen atom, and linear and branched, saturated and unsaturated groups comprising from 1-20 carbon atoms, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched groups optionally form at least one 3- to 7-membered ring comprising at least one carbon atom, with the provisos that:
• (i) said R2, R3 and R4 do not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• (ii) said R4 is chosen from a group other than a hydroxyl group, a thio group, an amino group, and a substituted or unsubstituted sulphonylamino group;
• and
• (iii) said R2, R3 and R4 are not directly linked to the benzene ring of formula (I) by a —NH—NH—;
• wherein
• said R1 and said R2 optionally form a saturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the proviso that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• wherein
• said R2 and said R5 optionally form a saturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the provisos that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• and
• (ii) when said R2 and said R5 form a saturated ring comprising 5- to 7-members, said R5 optionally is a bond;
• wherein
• said R2 and said R6 optionally form a saturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the provisos that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• and
• (ii) when said R2 and said R6 form a saturated ring comprising 5- to 7-members, said R6 optionally is a bond;
• Y is chosen from:
• a hydrogen atom;
• a halogen atom;
• a group chosen from —OR8, —SR8, and —NH—SO2R8, wherein
• R8 is chosen from:
• linear and branched C1-C8 alkyl groups, optionally substituted with at least one group chosen from a halogen atom, a hydroxyl group, C1-C4 alkoxy groups, an amino group, amino(C1-C4 alkyl) groups, a carboxyl group, and C1-C4 alkoxycarbonyl groups, wherein at least one branch of said branched C1-C8 alkyl groups optionally forms at least one 3- to 6-membered ring;
• a phenyl group, optionally substituted with one or two groups chosen from C1-C4 alkyl groups, a trifluoromethyl group, a carboxyl group, C1-C4 alkoxycarbonyl groups, a halogen atom, a hydroxyl group, C1-C4 alkoxy groups, an amino group and amino(C1-C4 alkyl) groups;
• and
• a benzyl group, optionally substituted with one or two oxy groups, with the proviso that:
• (i) when R2 is a hydroxyl group, Y is not a —NH—SO2R8 group;
• provided that:
• (i) when said R2 and said R4 are hydrogen atoms, and when said R3 is chosen from substituted and unsubstituted C1-C4 alkyl groups, X is not a an —OR5 group, wherein R5 is chosen from substituted and unsubstituted C1-C4 alkyl groups;
• (ii) when said R2 and said R4 are hydrogen atoms, and when said R3 is chosen from substituted and unsubstituted C1-C4 alkyl groups, X is not a NR6R7 group;
• and
• (iii) when said R2, said R4, and said Y, are hydrogen atoms, and when said X is a NR6R7 group, wherein said R6 and R7 are hydrogen atoms, said R3 is not chosen from a fluorine atom, a chlorine atom and a bromine atom.

A composition for oxidation dyeing keratinous fibers comprising, in a medium suitable for dyeing:

• (a) at least one oxidation base;
• and
• (b) at least one coupler chosen from compounds of formula (I) and acid addition salts thereof:
• in which:
• R1 is chosen from a hydrogen atom, linear and branched, saturated and unsaturated groups comprising from 1-15 carbon atoms, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched groups optionally forms at least one 3- to 7-membered ring comprising at least one carbon atom, with the provisos that:
• (i) said R1 does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group, and
• (ii) said SO2 group is not directly linked to the nitrogen at the 7-position of formula (I);
• X is chosen from groups OR5 and NR6R7, wherein
• R5 is chosen from:
• a Group A1, wherein said Group A1 is chosen from a hydroxyl group, a dimethylamino group, and linear and branched C1-C8 alkyl groups optionally unsaturated and optionally substituted with at least one unit chosen from:
• a Group A2, A4, or A5 as defined below;
• one or two groups, which are identical or different, chosen from N—(C1-C3)alkylamino, N—(C1-C3)alkyl-N—(C1-C3)alkylamino, (C1-C6)alkoxy, oxo, alkoxycarbonyl, acyloxy, amide, acylamino, ureyl, sulphoxy, sulphonyl, sulphonamido, sulphonylamino, bromo, cyano, amino, and carboxyl;
• and
• one or more groups chosen from a hydroxyl group, a fluoro group, and chloro group;
• a Group A2, wherein said Group A2 is an aromatic group chosen from a phenyl group, and a naphthyl group, wherein said aromatic group is optionally substituted with one to three groups, which are identical or different, chosen from methyl, trifluoromethyl, ethyl, isopropyl, butyl, pentyl, fluoro, chloro, bromo, methoxy, trifluoromethoxy, ethoxy, propyloxy, acetyloxy, acetyl, amino, oxy, and cyano;
• a Group A3, wherein said Group A3 is a heteroaromatic group chosen from furanyl, thiophenyl, pyrrolyl, imidazolyl, thiazolyl, oxazolyl, 1,2,3-triazolyl, 1,2,4-triazolyl, isoxazolyl, isothiazolyl, pyrazolyl, pyrazolotriazolyl, pyrazoloimidazolyl, pyrrolotriazolyl, pyrazolopyrimidyl, pyrazolopyridyl, pyridyl, pyrimidyl, benzoimidazolyl, benzoxazolyl, benzothiazolyl, indolyl, indolidinyl, isoindolyl, indazolyl, benzotriazolyl, quinolinyl, benzoimidazolyl and benzopyrimidyl, wherein said heteroaromatic group is optionally substituted with 1 to 3 groups chosen from linear and branched C1-C4 alkyl groups, a C1-C4 monohydroxyalkyl group, a C2-C4 polyhydroxyalkyl group, a carboxyl group, an alkoxycarbonyl group, an amido group, an amino group, a hydroxyl group, and a halogen atom;
• a Group A4 is a group chosen from C3-C7 cycloalkyl and norbornyl;
• wherein said C3-C7 cycloalkyl group and said norbornyl group further comprise at least one double bond, and wherein said C3-C7 cycloalkyl group and said norbornyl group are optionally substituted with 1 or 2 units chosen from linear and branched C1-C4 alkyl groups, a C1-C4 monohydroxyalkyl group, a C2-C4 polyhydroxyalkyl group, a carboxyl group, an alkoxycarbonyl group, an amido group, an amino group, a hydroxyl group, an oxy group, and a halogen atom;
• and
• a Group A5, wherein said Group A5 is a heterocycle chosen from dihydrofuranyl;
• tetrahydrofuranyl;
• butyrolactonyl;
• dihydrothiophenyl;
• tetrahydrothiophenyl;
• tetrahydrothiophenonyl;
• iminothiolane;
• dihydropyrrolyl;
• pyrrolidinyl;
• pyrrolidinonyl;
• imidazolidinonyl;
• imidazolidinethionyl;
• oxazolidinyl;
• oxazolidinonyl;
• oxazolanethione;
• thiazolidinyl;
• isothiazolonyl;
• mercaptothiazolinyl;
• pyrazolidinonyl;
• iminothiolane;
• dioxolanyl;
• pentalactone;
• dioxanyl;
• dihydropyridinyl;
• piperidinyl;
• pentalactam;
• morpholinyl;
• pyrazoli(di)nyl;
• pyrimi(di)nyl;
• pyrazinyl;
• piperazinyl;
• and azepinyl;
• R6 and R7, which are identical or different, are each chosen from a hydrogen atom, linear and branched, saturated and unsaturated groups comprising from 1-20 carbon atoms, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched groups optionally forms at least one 3- to 7-membered ring comprising at least one carbon atom, with the proviso that:
• (i) both said R6 and R7 do not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group, and
• said R6 and R7 optionally form a ring chosen from a saturated and an unsaturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R, wherein
• R is chosen from linear, branched, saturated, and unsaturated, C1-C6 alkyl groups, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched C1-C6 alkyl group optionally forms at least one saturated or unsaturated 3- to 6-membered ring;
• with the proviso that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• wherein
• said R1 and said R5 optionally form a ring chosen from a saturated and an unsaturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the proviso that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• and
• said R1 and said R6 optionally form a ring, chosen from a saturated and an unsaturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the proviso that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• R2, R3, and R4, which are identical or different, are each chosen from a hydrogen atom, a halogen atom, and linear and branched, saturated and unsaturated groups comprising from 1-20 carbon atoms, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched groups optionally form at least one 3- to 7-membered ring comprising at least one carbon atom, with the provisos that:
• (i) said R2, R3 and R4 do not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• (ii) said R4 is chosen from a group other than a hydroxyl group, a thio group, an amino group, and a substituted or unsubstituted sulphonylamino group;
• and
• (iii) said R2, R3 and R4 are not directly linked to the benzene ring of formula (I) by a —NH—NH—;
• wherein
• said R1 and said R2 optionally form a saturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the proviso that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• wherein
• said R2 and said R5 optionally form a saturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the provisos that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• and
• (ii) when said R2 and said R5 form a saturated ring comprising 5- to 7-members, said R5 optionally is a bond;
• wherein
• said R2 and said R6 optionally form a saturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the provisos that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• and
• (ii) when said R2 and said R6 form a saturated ring comprising 5- to 7-members, said R6 optionally is a bond;
• Y is chosen from:
• a hydrogen atom;
• a halogen atom;
• a group chosen from —OR8, —SR8, and —NH—SO2R8, wherein
• R8 is chosen from:
• linear and branched C1-C8 alkyl groups, optionally substituted with at least one group chosen from a halogen atom, a hydroxyl group, C1-C4 alkoxy groups, an amino group, amino(C1-C4 alkyl) groups, a carboxyl group, and C1-C4 alkoxycarbonyl groups, wherein at least one branch of said branched C1-C8 alkyl groups optionally forms at least one 3- to 6-membered ring;
• a phenyl group, optionally substituted with one or two groups chosen from C1-C4 alkyl groups, a trifluoromethyl group, a carboxyl group, C1-C4 alkoxycarbonyl groups, a halogen atom, a hydroxyl group, C1-C4 alkoxy groups, an amino group and amino(C1-C4 alkyl) groups;
• and
• a benzyl group, optionally substituted with one or two oxy groups, with the proviso that:
• (i) when R2 is a hydroxyl group, Y is not a —NH—SO2R8 group;
• provided that:
• (i) when said R2 and said R4 are hydrogen atoms, and when said R3 is chosen from substituted and unsubstituted C1-C4 alkyl groups, X is not a an —OR5 group, wherein R5 is chosen from substituted and unsubstituted C1-C4 alkyl groups;
• (ii) when said R2 and said R4 are hydrogen atoms, and when said R3 is chosen from substituted and unsubstituted C1-C4 alkyl groups, X is not a NR6R7 group;
• and
• (iii) when said R2, said R4, and said Y, are hydrogen atoms, and when said X is a NR6R7 group, wherein said R6 and R7 are hydrogen atoms, said R3 is not chosen from a fluorine atom, a chlorine atom and a bromine atom.

A composition for oxidation dyeing keratinous fibers comprising, in a medium suitable for dyeing:

• (a) at least one oxidation base;
• and
• (b) at least one coupler chosen from compounds of formula (I) and acid addition salts thereof:
• in which:
• R1 is chosen from a hydrogen atom, linear and branched, saturated and unsaturated groups comprising from 1-15 carbon atoms, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched groups optionally forms at least one 3- to 7-membered ring comprising at least one carbon atom, with the provisos that:
• (i) said R1 does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group, and
• (ii) said SO2 group is not directly linked to the nitrogen at the 7-position of formula (I);
• X is chosen from groups OR5 and NR6R7, wherein
• R5 is chosen from linear and branched, saturated and unsaturated groups comprising from 1-20 carbon atoms, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched groups optionally forms at least one 3- to 7-membered ring comprising at least one carbon atom, with the proviso that:
• (i) said R5 does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• R6 and R7, which are identical or different, are each chosen from:
• a hydrogen atom,
• a Group A1, wherein said Group A1 is chosen from a hydroxyl group, a dimethylamino group, and linear and branched C1-C8 alkyl groups optionally unsaturated and optionally substituted with at least one unit chosen from:
• a Group A2, A4 or A5 as defined below;
• one or two groups, which are identical or different, chosen from N—(C1-C3)alkylamino, N—(C1-C3)alkyl-N—(C1-C3)alkylamino (C1-C6)alkoxy, oxo, alkoxycarbonyl, acyloxy, amide, acylamino, ureyl, sulphoxy, sulphonyl, sulphonamido, sulphonylamino, bromo, cyano, amino, and carboxyl;
• and
• one or more groups chosen from a hydroxyl group, a fluoro group, and chloro group;
• a Group A2, wherein said Group A2 is an aromatic group chosen from a phenyl group, and a naphthyl group, wherein said aromatic group is optionally substituted with one to three groups, which are identical or different, chosen from methyl, trifluoromethyl, ethyl, isopropyl, butyl, pentyl, fluoro, chloro, bromo, methoxy, trifluoromethoxy, ethoxy, propyloxy, acetyloxy, acetyl, amino, oxy, and cyano;
• a Group A3, wherein said Group A3 is a heteroaromatic group chosen from furanyl, thiophenyl, pyrrolyl, imidazolyl, thiazolyl, oxazolyl, 1,2,3-triazolyl, 1,2,4-triazolyl, isoxazolyl, isothiazolyl, pyrazolyl, pyrazolotriazolyl, pyrazoloimidazolyl, pyrrolotriazolyl, pyrazolopyrimidyl, pyrazolopyridyl, pyridyl, pyrimidyl, benzoimidazolyl, benzoxazolyl, benzothiazolyl, indolyl, indolidinyl, isoindolyl, indazolyl, benzotriazolyl, quinolinyl, benzoimidazolyl and benzopyrimidyl, wherein said heteroaromatic group is optionally substituted with 1 to 3 groups chosen from linear and branched C1-C4 alkyl groups, a C1-C4 monohydroxyalkyl group, a C2-C4 polyhydroxyalkyl group, a carboxyl group, an alkoxycarbonyl group, an amido group, an amino group, a hydroxyl group, and a halogen atom;
• a Group A4 is a group chosen from C3-C7 cycloalkyl and norbornyl;
• wherein said C3-C7 cycloalkyl group and said norbornyl group further comprise at least one double bond, and wherein said C3-C7 cycloalkyl group and said norbornyl group are optionally substituted with 1 or 2 units chosen from linear and branched C1-C4 alkyl groups, a C1-C4 monohydroxyalkyl group, a C2-C4 polyhydroxyalkyl group, a carboxyl group, an alkoxycarbonyl group, an amido group, an amino group, a hydroxyl group, an oxy group, and a halogen atom;
• and
• a Group A5, wherein said Group A5 is a heterocycle chosen from dihydrofuranyl;
• tetrahydrofuranyl;
• butyrolactonyl;
• dihydrothiophenyl;
• tetrahydrothiophenyl;
• tetrahydrothiophenonyl;
• iminothiolane;
• dihydropyrrolyl;
• pyrrolidinyl;
• pyrrolidinonyl;
• imidazolidinonyl;
• imidazolidinethionyl;
• oxazolidinyl;
• oxazolidinonyl;
• oxazolanethione;
• thiazolidinyl;
• isothiazolonyl;
• mercaptothiazolinyl;
• pyrazolidinonyl;
• iminothiolane;
• dioxolanyl;
• pentalactone;
• dioxanyl;
• dihydropyridinyl;
• piperidinyl;
• pentalactam;
• morpholinyl;
• pyrazoli(di)nyl;
• pyrimi(di)nyl;
• pyrazinyl;
• piperazinyl;
• and azepinyl;
• wherein
• said R1 and said R5 optionally form a ring chosen from a saturated and an unsaturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the proviso that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• and
• said R1 and said R6 optionally form a ring, chosen from a saturated and an unsaturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the proviso that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• R2, R3, and R4, which are identical or different, are each chosen from a hydrogen atom, a halogen atom, and linear and branched, saturated and unsaturated groups comprising from 1-20 carbon atoms, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched groups optionally form at least one 3- to 7-membered ring comprising at least one carbon atom, with the provisos that:
• (i) said R2, R3 and R4 do not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• (ii) said R4 is chosen from a group other than a hydroxyl group, a thio group, an amino group, and a substituted or unsubstituted sulphonylamino group;
• and
• (iii) said R2, R3 and R4 are not directly linked to the benzene ring of formula (I) by a —NH—NH—;
• wherein
• said R1 and said R2 optionally form a saturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the proviso that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• wherein
• said R2 and said R5 optionally form a saturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the provisos that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• and
• (ii) when said R2 and said R5 form a saturated ring comprising 5- to 7-members, said R5 optionally is a bond;
• wherein
• said R2 and said R6 optionally form a saturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the provisos that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• and
• (ii) when said R2 and said R6 form a saturated ring comprising 5- to 7-members, said R6 optionally is a bond;
• Y is chosen from:
• a hydrogen atom;
• a halogen atom;
• a group chosen from —OR8, —SR8, and —NH—SO2R8, wherein
• R8 is chosen from:
• linear and branched C1-C8 alkyl groups, optionally substituted with at least one group chosen from a halogen atom, a hydroxyl group, C1-C4 alkoxy groups, an amino group, amino(C1-C4 alkyl) groups, a carboxyl group, and C1-C4 alkoxycarbonyl groups, wherein at least one branch of said branched C1-C8 alkyl groups optionally forms at least one 3- to 6-membered ring;
• a phenyl group, optionally substituted with one or two groups chosen from C1-C4 alkyl groups, a trifluoromethyl group, a carboxyl group, C1-C4 alkoxycarbonyl groups, a halogen atom, a hydroxyl group, C1-C4 alkoxy groups, an amino group and amino(C1-C4 alkyl) groups;
• and
• a benzyl group, optionally substituted with one or two oxy groups, with the proviso that:
• (i) when R2 is a hydroxyl group, Y is not a —NH—SO2R8 group;
• provided that:
• (i) when said R2 and said R4 are hydrogen atoms, and when said R3 is chosen from substituted and unsubstituted C1-C4 alkyl groups, X is not a an —OR5 group, wherein R5 is chosen from substituted and unsubstituted C1-C4 alkyl groups;
• (ii) when said R2 and said R4 are hydrogen atoms, and when said R3 is chosen from substituted and unsubstituted C1-C4 alkyl groups, X is not a NR6R7 group;
• and
• (iii) when said R2, said R4, and said Y, are hydrogen atoms, and when said X is a NR6R7 group, wherein said R6 and R7 are hydrogen atoms, said R3 is not chosen from a fluorine atom, a chlorine atom and a bromine atom.

A composition for oxidation dyeing keratinous fibers comprising, in a medium suitable for dyeing:

• (a) at least one oxidation base;
• and
• (b) at least one coupler chosen from compounds of formula (I) and acid addition salts thereof:
• wherein:
• R1 is chosen from a hydrogen atom, linear and branched, saturated and unsaturated groups comprising from 1-15 carbon atoms, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched groups optionally forms at least one 3- to 7-membered ring comprising at least one carbon atom, with the provisos that:
• (i) said R1 does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group, and
• (ii) said SO2 group is not directly linked to the nitrogen at the 7-position of formula (I);
• X is chosen from groups OR5 and NR6R7, wherein
• R5 is chosen from linear and branched, saturated and unsaturated groups comprising from 1-20 carbon atoms, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched groups optionally forms at least one 3- to 7-membered ring comprising at least one carbon atom, with the proviso that:
• (i) said R5 does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• R6 and R7, which are identical or different, are each chosen from a hydrogen atom, linear and branched, saturated and unsaturated groups comprising from 1-20 carbon atoms, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched groups optionally forms at least one 3- to 7-membered ring comprising at least one carbon atom, with the proviso that:
• (i) both said R6 and R7 do not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group, and
• said R6 and R7 optionally form a ring chosen from a saturated and an unsaturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R, wherein
• R is chosen from linear, branched, saturated, and unsaturated, C1-C6 alkyl groups, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched C1-C6 alkyl group optionally forms at least one saturated or unsaturated 3- to 6-membered ring;
• with the proviso that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• wherein
• said R1 and said R5 optionally form a ring chosen from a saturated and an unsaturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the proviso that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• and
• said R1 and said R6 optionally form a ring, chosen from a saturated and an unsaturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the proviso that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• R2, and R3 which are identical or different, are each chosen from:
• a hydrogen atom;
• a halogen atom;
• a hydroxyl group;
• an amino group;
• a group chosen from Group A1, Group A4, and Group A5, as defined below;
• a group chosen from Group A1, Group A2, Group A3, Group A4 and Group A5, as defined below, wherein said groups are attached to the phenolic nucleus in formula (I) by way of a group chosen from an oxygen atom, and a group chosen from —NH—, —Nalkyl(C1-C3)—, —O(CO)—, —NH(CO)—, —Nalkyl(C1-C3)(CO)—, —NH[C═NH]—, —NH(CO)NH—, —NH(CO)Nalkyl(C1-C3)—, —NH(CO)O—, —NHSO2—, —NHSO2NH— and —NHSO2Nalkyl(C1-C3)—;
• wherein:
• said Group A1 is chosen from a hydroxyl group, a dimethylamino group, and linear and branched C1-C8 alkyl groups optionally unsaturated and optionally substituted with at least one unit chosen from:
• a Group A2, A4, or A5 as defined below;
• one or two groups, which are identical or different, chosen from N—(C1-C3)alkylamino, N—(C1-C3)alkyl-N—(C1-C3)alkylamino, (C1-C6)alkoxy, oxo, alkoxycarbonyl, acyloxy, amide, acylamino, ureyl, sulphoxy, sulphonyl, sulphonamido, sulphonylamino, bromo, cyano, amino, and carboxyl;
• and
• one or more groups chosen from a hydroxyl group, a fluoro group, and chloro group;
• said Group A2 is an aromatic group chosen from a phenyl group, and a naphthyl group, wherein said aromatic group is optionally substituted with one to three groups, which are identical or different, chosen from methyl, trifluoromethyl, ethyl, isopropyl, butyl, pentyl, fluoro, chloro, bromo, methoxy, trifluoromethoxy, ethoxy, propyloxy, acetyloxy, acetyl, amino, oxy, and cyano;
• said Group A3, is a heteroaromatic group chosen from furanyl, thiophenyl, pyrrolyl, imidazolyl, thiazolyl, oxazolyl, 1,2,3-triazolyl, 1,2,4-triazolyl, isoxazolyl, isothiazolyl, pyrazolyl, pyrazolotriazolyl, pyrazoloimidazolyl, pyrrolotriazolyl, pyrazolopyrimidyl, pyrazolopyridyl, pyridyl, pyrimidyl, benzoimidazolyl, benzoxazolyl, benzothiazolyl, indolyl, indolidinyl, isoindolyl, indazolyl, benzotriazolyl, quinolinyl, benzoimidazolyl and benzopyrimidyl, wherein said heteroaromatic group is optionally substituted with 1 to 3 groups chosen from linear and branched C1-C4 alkyl groups, a C1-C4 monohydroxyalkyl group, a C2-C4 polyhydroxyalkyl group, a carboxyl group, an alkoxycarbonyl group, an amido group, an amino group, a hydroxyl group, and a halogen atom;
• said Group A4 is chosen from C3-C7 cycloalkyl and norbornyl;
• wherein said C3-C7 cycloalkyl group and said norbornyl group further comprise at least one double bond, and wherein said C3-C7 cycloalkyl group and said norbornyl group are optionally substituted with 1 or 2 units chosen from linear and branched C1-C4 alkyl groups, a C1-C4 monohydroxyalkyl group, a C2-C4 polyhydroxyalkyl group, a carboxyl group, an alkoxycarbonyl group, an amido group, an amino group, a hydroxyl group, an oxy group, and a halogen atom;
• and
• said Group A5 is a heterocycle chosen from dihydrofuranyl;
• tetrahydrofuranyl;
• butyrolactonyl;
• dihydrothiophenyl;
• tetrahydrothiophenyl;
• tetrahydrothiophenonyl;
• iminothiolane;
• dihydropyrrolyl;
• pyrrolidinyl;
• pyrrolidinonyl;
• imidazolidinonyl;
• imidazolidinethionyl;
• oxazolidinyl;
• oxazolidinonyl;
• oxazolanethione;
• thiazolidinyl;
• isothiazolonyl;
• mercaptothiazolinyl;
• pyrazolidinonyl;
• iminothiolane;
• dioxolanyl;
• pentalactone;
• dioxanyl;
• dihydropyridinyl;
• piperidinyl;
• pentalactam;
• morpholinyl;
• pyrazoli(di)nyl;
• pyrimi(di)nyl;
• pyrazinyl;
• piperazinyl;
• and azepinyl;
• R4 is chosen from a hydrogen atom, a halogen atom, and linear and branched, saturated and unsaturated groups comprising from 1-20 carbon atoms, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched groups optionally form at least one 3- to 7-membered ring comprising at least one carbon atom, with the provisos that:
• (i) said R4 does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• (ii) said R4 is chosen from a group other than a hydroxyl group, a thio group, an amino group, and a substituted or unsubstituted sulphonylamino group;
• and
• (iii) said R4 is not directly linked to the benzene ring of formula (I) by a —NH—NH—;
• wherein
• said R1 and said R2 optionally form a saturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the proviso that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• wherein
• said R2 and said R5 optionally form a saturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the provisos that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• and
• (ii) when said R2 and said R5 form a saturated ring comprising 5- to 7-members, said R5 optionally is a bond;
• wherein
• said R2 and said R6 optionally form a saturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the provisos that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• and
• (ii) when said R2 and said R6 form a saturated ring comprising 5- to 7-members, said R6 optionally is a bond;
• Y is chosen from:
• a hydrogen atom;
• a halogen atom;
• a group chosen from —OR8, —SR8, and —NH—SO2R8, wherein
• R8 is chosen from:
• linear and branched C1-C8 alkyl groups, optionally substituted with at least one group chosen from a halogen atom, a hydroxyl group, C1-C4 alkoxy groups, an amino group, amino(C1-C4 alkyl) groups, a carboxyl group, and C1-C4 alkoxycarbonyl groups, wherein at least one branch of said branched C1-C8 alkyl groups optionally forms at least one 3- to 6-membered ring;
• a phenyl group, optionally substituted with one or two groups chosen from C1-C4 alkyl groups, a trifluoromethyl group, a carboxyl group, C1-C4 alkoxycarbonyl groups, a halogen atom, a hydroxyl group, C1-C4 alkoxy groups, an amino group and amino(C1-C4 alkyl) groups;
• and
• a benzyl group, optionally substituted with one or two oxy groups, with the proviso that:
• (i) when R2 is a hydroxyl group, Y is not a —NH—SO2R8 group;
• provided that:
• (i) when said R2 and said R4 are hydrogen atoms, and when said R3 is chosen from substituted and unsubstituted C1-C4 alkyl groups, X is not a an —OR5 group, wherein R5 is chosen from substituted and unsubstituted C1-C4 alkyl groups;
• (ii) when said R2 and said R4 are hydrogen atoms, and when said R3 is chosen from substituted and unsubstituted C1-C4 alkyl groups, X is not a NR6R7 group;
• and
• (iii) when said R2, said R4, and said Y, are hydrogen atoms, and when said X is a NR6R7 group, wherein said R6 and R7 are hydrogen atoms, said R3 is not chosen from a fluorine atom, a chlorine atom and a bromine atom.

A composition for oxidation dyeing keratinous fibers comprising, in a medium suitable for dyeing:

• (a) at least one oxidation base;
• and
• (b) at least one coupler chosen from compounds of formula (I) and acid addition salts thereof:
• wherein:
• R1 is chosen from a hydrogen atom, linear and branched, saturated and unsaturated groups comprising from 1-15 carbon atoms, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched groups optionally forms at least one 3- to 7-membered ring comprising at least one carbon atom, with the provisos that:
• (i) said R1 does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group, and
• (ii) said SO2 group is not directly linked to the nitrogen at the 7-position of formula (I);
• R2 is chosen from:
• a hydrogen atom;
• a chlorine atom;
• a group chosen from methyl, hydroxymethyl, methoxymethyl, 2-hydroxyethyl, aminomethyl, methylaminomethyl, hydroxyl, methoxy, acetoxy, amino, methylamino and 2-hydroxyethylamino;
• a group —NH(CO)R9, wherein in R9 is a unit of a group (G1) chosen from:
• methyl, ethyl, propyl, isopropyl, butyl, isobutyl, tert-butyl, pentyl, isopentyl, neopentyl, hexyl;
• cyclopropyl, cyclobutyl, cyclopentyl, cyclopentylmethyl, 3-cyclopentylpropyl, cyclohexyl, 2-cyclohexylethyl, norborn-2-yl, vinyl, 1-methylvinyl, 2-methylvinyl, 2,2-dimethylvinyl, allyl, 3-butenyl;
• phenyl, methylphenyl, dimethylphenyl, 2,4,6-trimethylphenyl, 4-ethylphenyl, (trifluoromethyl)phenyl, hydroxyphenyl, methoxyphenyl, ethoxyphenyl, acetoxyphenyl, (trifluoromethoxy)phenyl, aminophenyl,
• 4-dimethylaminophenyl, fluorophenyl, difluorophenyl, fluoro(trifluoromethyl)phenyl, chlorophenyl, dichlorophenyl, bromophenyl, naphth-1-yl, naphth-2-yl, (2-methoxy)naphth-1-yl, benzyl, 4′-methoxybenzyl, 2′,5′-dimethoxybenzyl, 3′,4′-dimethoxybenzyl,
• 4′-fluorobenzyl, 4′-chlorobenzyl, phenethyl, 2-phenylvinyl, (1-naphthyl)methyl, (2-naphthyl)methyl;
• tetrahydrofuran-2-yl, furan-2-yl, 5-methyl-2-(trifluoromethyl)furan-3-yl, 2-methyl-5-phenylfuran-3-yl, thiophen-2-yl, (thiophen-2-yl)methyl, 3-chlorothiophen-2-yl,
• 2,5-dichlorothiophen-3-yl, benzothiophen-2-yl, 3-chlorobenzothiophen-2-yl, isoxazol-5-yl, 5-methylisoxazol-3-yl, 3,5-dimethylisoxazol-4-yl, 1,3-dimethylpyrazol-5-yl, 1-ethyl-3-methylpyrazol-5-yl, 1-tert-butyl-3-methylpyrazol-5-yl, 3-tert-butyl-1-methylpyrazol-5-yl, 4-bromo-1-ethyl-3-methylpyrazol-5-yl, indol-3-ylcarboxyl, pyridinyl, chloropyridinyl, dichloropyridinyl,
• 5-(bromo)pyridin-3-yl, piperazin-2-yl, quinoxal-2-yl;
• fluoromethyl, difluoromethyl, trifluoromethyl, 1,1,2,2-tetrafluoroethyl, pentafluoroethyl, heptafluoropropyl, 1,1,2,2,3,3,4,4-octafluorobutyl, nonafluorobutyl, chloromethyl, chloroethyl, 1,1-dimethyl-2-chloroethyl,
• 1,2-dichloroethyl, 1-chloropropyl, 3-chloropropyl, 4-chlorobutyl, hydroxymethyl, methoxymethyl, phenoxymethyl, (4-chlorophenoxy)methyl, benzyloxymethyl, acetoxymethyl, 1,2-dihydroxyethyl, 1-phenoxyethyl, 1-acetoxyethyl, 2-(2-carboxyethoxy)ethyl, 1-phenoxyethyl, 1-acetoxyethyl, methoxycarbonyl, ethoxycarbonyl, (methoxycarbonyl)methyl, 2-carboxyethyl, 2-(methoxycarbonyl)ethyl, 2-carboxycyclopropyl, 2-carboxycyclohexane;
• methoxy, ethoxy, propoxy, isopropoxy, butoxy, isobutoxy, pentoxy, neopentoxy, hexyloxy, cyclopentyloxy, cyclohexyloxy, vinyloxy, allyloxy, propargyloxy, chloromethoxy, 2-chloroethoxy, 1-chloroethoxy, 2-methoxyethoxy, 4-chlorobutoxy, phenoxy, 4-methylphenoxy, 4-fluorophenoxy, 4-bromophenoxy, 4-chlorophenoxy, 4-methoxyphenoxy, naphth-2-yloxy, benzyloxy;
• amino, methylamino, ethylamino, propylamino, isopropylamino, butylamino, cyclohexylamino, allylamino, 2-chloroethylamino, 3-chloropropylamino, carboxymethylamino, phenylamino, fluorophenylamino, (trifluoromethyl)phenylamino, chlorophenylamino, bromophenylamino, 4-acetylphenylamino, methoxyphenylamino, (trifluoromethoxy)phenylamino, naphth-1-ylamino, benzylamino, phenethylamino, pyridylamino, pyrid-3-ylamino, dimethylamino,
• 1-pyrrolidinyl, and 4-morpholinyl;
• a group —NHSO2R10, wherein R10 is a unit of a group (G2), chosen from methyl, trifluoromethyl, ethyl, 2-chloroethyl, propyl, 3-chloropropyl, isopropyl, butyl, thiophen-2-yl, hydroxyl, ethoxy and dimethylamino;
• X is chosen from groups OR5 and NR6R7, wherein
• R5 is chosen from linear and branched, saturated and unsaturated groups comprising from 1-20 carbon atoms, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched groups optionally forms at least one 3- to 7-membered ring comprising at least one carbon atom, with the proviso that:
• (i) said R5 does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• R6 and R7, which are identical or different, are each chosen from a hydrogen atom, linear and branched, saturated and unsaturated groups comprising from 1-20 carbon atoms, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched groups optionally forms at least one 3- to 7-membered ring comprising at least one carbon atom, with the proviso that:
• (i) both said R6 and R7 do not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group, and
• said R6 and R7 optionally form a ring chosen from a saturated and an unsaturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R, wherein
• R is chosen from linear, branched, saturated, and unsaturated, C1-C6 alkyl groups, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched C1-C6 alkyl group optionally forms at least one saturated or unsaturated 3- to 6-membered ring;
• with the proviso that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• wherein
• said R1 and said R5 optionally form a ring chosen from a saturated and an unsaturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the proviso that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• and
• said R1 and said R6 optionally form a ring, chosen from a saturated and an unsaturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the proviso that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• R3, and R4, which are identical or different, are each chosen from a hydrogen atom, a halogen atom, and linear and branched, saturated and unsaturated groups comprising from 1-20 carbon atoms, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched groups optionally form at least one 3- to 7-membered ring comprising at least one carbon atom, with the provisos that:
• (i) said R3 and R4 do not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• (ii) said R4 is chosen from a group other than a hydroxyl group, a thio group, an amino group, and a substituted or unsubstituted sulphonylamino group;
• and
• (iii) said R3 and said R4 are not directly linked to the benzene ring of formula (I) by a —NH—NH—;
• wherein
• said R1 and said R2 optionally form a saturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the proviso that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• wherein
• said R2 and said R5 optionally form a saturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the provisos that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• and
• (ii) when said R2 and said R5 form a saturated ring comprising 5- to 7-members, said R5 optionally is a bond;
• wherein
• said R2 and said R6 optionally form a saturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the provisos that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• and
• (ii) when said R2 and said R6 form a saturated ring comprising 5- to 7-members, said R6 optionally is a bond;
• Y is chosen from:
• a hydrogen atom;
• a halogen atom;
• a group chosen from —OR8, —SR8, and —NH—SO2R8, wherein
• R8 is chosen from:
• linear and branched C1-C8 alkyl groups, optionally substituted with at least one group chosen from a halogen atom, a hydroxyl group, C1-C4 alkoxy groups, an amino group, amino(C1-C4 alkyl) groups, a carboxyl group, and C1-C4 alkoxycarbonyl groups, wherein at least one branch of said branched C1-C8 alkyl groups optionally forms at least one 3- to 6-membered ring;
• a phenyl group, optionally substituted with one or two groups chosen from C1-C4 alkyl groups, a trifluoromethyl group, a carboxyl group, C1-C4 alkoxycarbonyl groups, a halogen atom, a hydroxyl group, C1-C4 alkoxy groups, an amino group and amino(C1-C4 alkyl) groups;
• and
• a benzyl group, optionally substituted with one or two oxy groups, with the proviso that:
• (i) when R2 is a hydroxyl group, Y is not a —NH—SO2R8 group;
• provided that:
• (i) when said R2 and said R4 are hydrogen atoms, and when said R3 is chosen from substituted and unsubstituted C1-C4 alkyl groups, X is not a an —OR5 group, wherein R5 is chosen from substituted and unsubstituted C1-C4 alkyl groups;
• (ii) when said R2 and said R4 are hydrogen atoms, and when said R3 is chosen from substituted and unsubstituted C1-C4 alkyl groups, X is not a NR6R7 group;
• and
• (iii) when said R2, said R4, and said Y, are hydrogen atoms, and when said X is a NR6R7 group, wherein said R6 and R7 are hydrogen atoms, said R3 is not chosen from a fluorine atom, a chlorine atom and a bromine atom.

A composition for oxidation dyeing keratinous fibers comprising, in a medium suitable for dyeing:

• (a) at least one oxidation base;
• and
• (b) at least one coupler chosen from compounds of formula (I) and acid addition salts thereof:
• wherein:
• R1 is chosen from a hydrogen atom, linear and branched, saturated and unsaturated groups comprising from 1-15 carbon atoms, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched groups optionally forms at least one 3- to 7-membered ring comprising at least one carbon atom, with the provisos that:
• (i) said R1 does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group, and
• (ii) said SO2 group is not directly linked to the nitrogen at the 7-position of formula (I);
• R2 is chosen from:
• a hydrogen atom;
• a group chosen from methyl;
• hydroxymethyl;
• aminomethyl;
• hydroxyl;
• methoxy;
• amino;
• and methylamino;
• a group chosen from methanesulphonylamino;
• ethanesulphonylamino;
• and dimethylaminosulphonylamino;
• and
• a group —NH(CO)R11 wherein R11 is a unit of a group (G3) chosen from:
• methyl, ethyl, propyl, allyl, phenyl, tetrahydrofuran-2-yl, furan-2-yl, thiophen-2-yl, pyridinyl, piperazin-2-yl, fluoromethyl, chloromethyl, 2-chloroethyl, methoxymethyl, acetoxymethyl, 1,2-dihydroxyethyl, methoxycarbonyl, 2-carboxyethyl, methoxy, ethoxy, propoxy, allyloxy, 2-chloroethoxy, 2-methoxyethoxy, amino, ethylamino, allylamino, 2-chloroethylamino, pyridylamino, dimethylamino, 1-pyrrolidinyl and 4-morpholinyl;
• X is chosen from groups OR5 and NR6R7, wherein
• R5 is chosen from linear and branched, saturated and unsaturated groups comprising from 1-20 carbon atoms, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched groups optionally forms at least one 3- to 7-membered ring comprising at least one carbon atom, with the proviso that:
• (i) said R5 does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• R6 and R7, which are identical or different, are each chosen from a hydrogen atom, linear and branched, saturated and unsaturated groups comprising from 1-20 carbon atoms, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched groups optionally forms at least one 3- to 7-membered ring comprising at least one carbon atom, with the proviso that:
• (i) both said R6 and R7 do not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group, and
• said R6 and R7 optionally form a ring chosen from a saturated and an unsaturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R, wherein
• R is chosen from linear, branched, saturated, and unsaturated, C1-C6 alkyl groups, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched C1-C6 alkyl group optionally forms at least one saturated or unsaturated 3- to 6-membered ring;
• with the proviso that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• wherein
• said R1 and said R5 optionally form a ring chosen from a saturated and an unsaturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the proviso that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• and
• said R1 and said R6 optionally form a ring, chosen from a saturated and an unsaturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the proviso that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• R3, and R4, which are identical or different, are each chosen from a hydrogen atom, a halogen atom, and linear and branched, saturated and unsaturated groups comprising from 1-20 carbon atoms, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched groups optionally form at least one 3- to 7-membered ring comprising at least one carbon atom, with the provisos that:
• (i) said R3 and R4 do not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• (ii) said R4 is chosen from a group other than a hydroxyl group, a thio group, an amino group, and a substituted or unsubstituted sulphonylamino group;
• and
• (iii) said R3 and said R4 are not directly linked to the benzene ring of formula (I) by a —NH—NH—;
• wherein
• said R1 and said R2 optionally form a saturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the proviso that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• wherein
• said R2 and said R5 optionally form a saturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the provisos that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• and
• (ii) when said R2 and said R5 form a saturated ring comprising 5- to 7-members, said R5 optionally is a bond;
• wherein
• said R2 and said R6 optionally form a saturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the provisos that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• and
• (ii) when said R2 and said R6 form a saturated ring comprising 5- to 7-members, said R6 optionally is a bond;
• Y is chosen from:
• a hydrogen atom;
• a halogen atom;
• a group chosen from —OR8, —SR8, and —NH—SO2R8, wherein
• R8 is chosen from:
• linear and branched C1-C8 alkyl groups, optionally substituted with at least one group chosen from a halogen atom, a hydroxyl group, C1-C4 alkoxy groups, an amino group, amino(C1-C4 alkyl) groups, a carboxyl group, and C1-C4 alkoxycarbonyl groups, wherein at least one branch of said branched C1-C8 alkyl groups optionally forms at least one 3- to 6-membered ring;
• a phenyl group, optionally substituted with one or two groups chosen from C1-C4 alkyl groups, a trifluoromethyl group, a carboxyl group, C1-C4 alkoxycarbonyl groups, a halogen atom, a hydroxyl group, C1-C4 alkoxy groups, an amino group and amino(C1-C4 alkyl) groups;
• and
• a benzyl group, optionally substituted with one or two oxy groups, with the proviso that:
• (i) when R2 is a hydroxyl group, Y is not a —NH—SO2R8 group;
• provided that:
• (i) when said R2 and said R4 are hydrogen atoms, and when said R3 is chosen from substituted and unsubstituted C1-C4 alkyl groups, X is not a an —OR5 group, wherein R5 is chosen from substituted and unsubstituted C1-C4 alkyl groups;
• (ii) when said R2 and said R4 are hydrogen atoms, and when said R3 is chosen from substituted and unsubstituted C1-C4 alkyl groups, X is not a NR6R7 group;
• and
• (iii) when said R2, said R4, and said Y, are hydrogen atoms, and when said X is a NR6R7 group, wherein said R6 and R7 are hydrogen atoms, said R3 is not chosen from a fluorine atom, a chlorine atom and a bromine atom.

A composition for oxidation dyeing keratinous fibers comprising, in a medium suitable for dyeing:

• (a) at least one oxidation base;
• and
• (b) at least one coupler chosen from compounds of formula (I) and acid addition salts thereof:
• wherein:
• R1 is chosen from a hydrogen atom, linear and branched, saturated and unsaturated groups comprising from 1-15 carbon atoms, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched groups optionally forms at least one 3- to 7-membered ring comprising at least one carbon atom, with the provisos that:
• (i) said R1 does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group, and
• (ii) said SO2 group is not directly linked to the nitrogen at the 7-position of formula (I);
• X is chosen from groups OR5 and NR6R7, wherein
• R5 is chosen from linear and branched, saturated and unsaturated groups comprising from 1-20 carbon atoms, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched groups optionally forms at least one 3- to 7-membered ring comprising at least one carbon atom, with the proviso that:
• (i) said R5 does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• R6 and R7, which are identical or different, are each chosen from a hydrogen atom, linear and branched, saturated and unsaturated groups comprising from 1-20 carbon atoms, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched groups optionally forms at least one 3- to 7-membered ring comprising at least one carbon atom, with the proviso that:
• (i) both said R6 and R7 do not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group, and
• said R6 and R7 optionally form a ring chosen from a saturated and an unsaturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R, wherein
• R is chosen from linear, branched, saturated, and unsaturated, C1-C6 alkyl groups, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched C1-C6 alkyl group optionally forms at least one saturated or unsaturated 3- to 6-membered ring;
• with the proviso that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• wherein
• said R1 and said R5 optionally form a ring chosen from a saturated and an unsaturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the proviso that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• and
• said R1 and said R6 optionally form a ring, chosen from a saturated and an unsaturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the proviso that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• R3 is chosen from:
• a hydrogen atom;
• a chlorine atom;
• a group chosen from methyl, ethyl, hydroxymethyl, 2-hydroxyethyl, methoxymethyl, aminomethyl, methylaminomethyl, hydroxyl, methoxy, acetoxy, amino, methylamino, 2-hydroxyethylamino, N-piperidino and N-morpholino;
• a group —NH(CO)R12, wherein R12 is a unit of a group (G1), chosen from
• methyl, ethyl, propyl, isopropyl, butyl, isobutyl, tert-butyl, pentyl, isopentyl, neopentyl, hexyl;
• cyclopropyl, cyclobutyl, cyclopentyl, cyclopentylmethyl, 3-cyclopentylpropyl, cyclohexyl, 2-cyclohexylethyl, norborn-2-yl, vinyl, 1-methylvinyl, 2-methylvinyl, 2,2-dimethylvinyl, allyl, 3-butenyl;
• phenyl, methylphenyl, dimethylphenyl, 2,4,6-trimethylphenyl, 4-ethylphenyl, (trifluoromethyl)phenyl, hydroxyphenyl, methoxyphenyl, ethoxyphenyl, acetoxyphenyl, (trifluoromethoxy)phenyl, aminophenyl, 4-dimethylaminophenyl, fluorophenyl, difluorophenyl, fluoro(trifluoromethyl)phenyl, chlorophenyl, dichlorophenyl, bromophenyl, naphth-1-yl, naphth-2-yl, (2-methoxy)naphth-1-yl, benzyl, 4′-methoxybenzyl, 2′,5′-dimethoxybenzyl, ′3,4′-dimethoxybenzyl, 4′-fluorobenzyl, 4′-chlorobenzyl, phenethyl, 2-phenylvinyl, (1-naphthyl)methyl, (2-naphthyl)methyl;
• tetrahydrofuran-2-yl, furan-2-yl, 5-methyl-2-(trifluoromethyl)furan-3-yl, 2-methyl-5-phenylfuran-3-yl, thiophen-2-yl, (thiophen-2-yl)methyl, 3-chlorothiophen-2-yl, 2,5-dichlorothiophen-3-yl, benzothiophen-2-yl, 3-chlorobenzothiophen-2-yl, isoxazol-5-yl, 5-methylisoxazol-3-yl, 3,5-dimethylisoxazol-4-yl, 1,3-dimethylpyrazol-5-yl, 1-ethyl-3-methylpyrazol-5-yl, 1-tert-butyl-3-methylpyrazol-5-yl, 3-tert-butyl-1-methylpyrazol-5-yl, 4-bromo-1-ethyl-3-methylpyrazol-5-yl, indol-3-ylcarboxyl, pyridinyl, chloropyridinyl, dichloropyridinyl,
• 5-(bromo)pyridin-3-yl, piperazin-2-yl, quinoxal-2-yl;
• fluoromethyl, difluoromethyl, trifluoromethyl, 1,1,2,2-tetrafluoroethyl, pentafluoroethyl, heptafluoropropyl, 1,1,2,2,3,3,4,4-octafluorobutyl, nonafluorobutyl, chloromethyl, chloroethyl, 1,1-dimethyl-2-chloroethyl,
• 1,2-dichloroethyl, 1-chloropropyl, 3-chloropropyl, 4-chlorobutyl, hydroxymethyl, methoxymethyl, phenoxymethyl, (4-chlorophenoxy)methyl, benzyloxymethyl, acetoxymethyl, 1,2-dihydroxyethyl, 1-phenoxyethyl, 1-acetoxyethyl, 2-(2-carboxyethoxy)ethyl, 1-phenoxyethyl, 1-acetoxyethyl, methoxycarbonyl, ethoxycarbonyl, (methoxycarbonyl)methyl, 2-carboxyethyl, 2-(methoxycarbonyl)ethyl, 2-carboxycyclopropyl, 2-carboxycyclohexane;
• methoxy, ethoxy, propoxy, isopropoxy, butoxy, isobutoxy, pentoxy, neopentoxy, hexyloxy, cyclopentyloxy, cyclohexyloxy, vinyloxy, allyloxy, propargyloxy, chloromethoxy, 2-chloroethoxy, 1-chloroethoxy, 2-methoxyethoxy, 4-chlorobutoxy, phenoxy, 4-methylphenoxy, 4-fluorophenoxy, 4-bromophenoxy, 4-chlorophenoxy, 4-methoxyphenoxy, naphth-2-yloxy, benzyloxy;
• amino, methylamino, ethylamino, propylamino, isopropylamino, butylamino, cyclohexylamino, allylamino, 2-chloroethylamino, 3-chloropropylamino, carboxymethylamino, phenylamino, fluorophenylamino, (trifluoromethyl)phenylamino, chlorophenylamino, bromophenylamino, 4-acetylphenylamino, methoxyphenylamino, (trifluoromethoxy)phenylamino, naphth-1-ylamino, benzylamino, phenethylamino, pyridylamino, pyrid-3-ylamino, dimethylamino,
• 1-pyrrolidinyl and 4-morpholinyl;
• and
• a group —NHSO2R13, wherein R13 is a unit of a group (G2), chosen from
• methyl, trifluoromethyl, ethyl, 2-chloroethyl, propyl, 3-chloropropyl, isopropyl, butyl, thiophen-2-yl, hydroxyl, ethoxy and dimethylamino;
• R2 and R4, which are identical or different, are each chosen from a hydrogen atom, a halogen atom, and linear and branched, saturated and unsaturated groups comprising from 1-20 carbon atoms, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched groups optionally form at least one 3- to 7-membered ring comprising at least one carbon atom, with the provisos that:
• (i) said R2 and R4 do not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• (ii) said R4 is chosen from a group other than a hydroxyl group, a thio group, an amino group, and a substituted or unsubstituted sulphonylamino group;
• and
• (iii) said R2 and R4 are not directly linked to the benzene ring of formula (I) by a —NH—NH—;
• wherein
• said R1 and said R2 optionally form a saturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the proviso that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• wherein
• said R2 and said R5 optionally form a saturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the provisos that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• and
• (ii) when said R2 and said R5 form a saturated ring comprising 5- to 7-members, said R5 optionally is a bond;
• wherein
• said R2 and said R6 optionally form a saturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the provisos that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• and
• (ii) when said R2 and said R6 form a saturated ring comprising 5- to 7-members, said R6 optionally is a bond;
• Y is chosen from:
• a hydrogen atom;
• a halogen atom;
• a group chosen from —OR8, —SR8, and —NH—SO2R8, wherein
• R8 is chosen from:
• linear and branched C1-C8 alkyl groups, optionally substituted with at least one group chosen from a halogen atom, a hydroxyl group, C1-C4 alkoxy groups, an amino group, amino(C1-C4 alkyl) groups, a carboxyl group, and C1-C4 alkoxycarbonyl groups, wherein at least one branch of said branched C1-C8 alkyl groups optionally forms at least one 3- to 6-membered ring;
• a phenyl group, optionally substituted with one or two groups chosen from C1-C4 alkyl groups, a trifluoromethyl group, a carboxyl group, C1-C4 alkoxycarbonyl groups, a halogen atom, a hydroxyl group, C1-C4 alkoxy groups, an amino group and amino(C1-C4 alkyl) groups;
• and
• a benzyl group, optionally substituted with one or two oxy groups, with the proviso that:
• (i) when R2 is a hydroxyl group, Y is not a —NH—SO2R8 group;
• provided that:
• (i) when said R2 and said R4 are hydrogen atoms, and when said R3 is chosen from substituted and unsubstituted C1-C4 alkyl groups, X is not a an —OR5 group, wherein R5 is chosen from substituted and unsubstituted C1-C4 alkyl groups;
• (ii) when said R2 and said R4 are hydrogen atoms, and when said R3 is chosen from substituted and unsubstituted C1-C4 alkyl groups, X is not a NR6R7 group;
• and
• (iii) when said R2, said R4, and said Y, are hydrogen atoms, and when said X is a NR6R7 group, wherein said R6 and R7 are hydrogen atoms, said R3 is not chosen from a fluorine atom, a chlorine atom and a bromine atom.

A composition for oxidation dyeing keratinous fibers comprising, in a medium suitable for dyeing:

• (a) at least one oxidation base;
• and
• (b) at least one coupler chosen from compounds of formula (I) and acid addition salts thereof:
• wherein:
• R1 is chosen from a hydrogen atom, linear and branched, saturated and unsaturated groups comprising from 1-15 carbon atoms, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched groups optionally forms at least one 3- to 7-membered ring comprising at least one carbon atom, with the provisos that:
• (i) said R1 does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group, and
• (ii) said SO2 group is not directly linked to the nitrogen at the 7-position of formula (I);
• X is chosen from groups OR5 and NR6R7, wherein
• R5 is chosen from linear and branched, saturated and unsaturated groups comprising from 1-20 carbon atoms, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched groups optionally forms at least one 3- to 7-membered ring comprising at least one carbon atom, with the proviso that:
• (i) said R5 does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• R6 and R7, which are identical or different, are each chosen from a hydrogen atom, linear and branched, saturated and unsaturated groups comprising from 1-20 carbon atoms, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched groups optionally forms at least one 3- to 7-membered ring comprising at least one carbon atom, with the proviso that:
• (i) both said R6 and R7 do not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group, and
• said R6 and R7 optionally form a ring chosen from a saturated and an unsaturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R, wherein
• R is chosen from linear, branched, saturated, and unsaturated, C1-C6 alkyl groups, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched C1-C6 alkyl group optionally forms at least one saturated or unsaturated 3- to 6-membered ring;
• with the proviso that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• wherein
• said R1 and said R5 optionally form a ring chosen from a saturated and an unsaturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the proviso that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• and
• said R1 and said R6 optionally form a ring, chosen from a saturated and an unsaturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the proviso that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• R3 is chosen from:
• a hydrogen atom;
• a chlorine atom;
• a group chosen from methyl, hydroxymethyl, aminomethyl, hydroxyl, methoxy, amino and methylamino;
• a group chosen from methanesulphonylamino;
• ethanesulphonylamino;
• and dimethylaminosulphonylamino;
• and
• a group —NH(CO)R14 wherein R14 is a unit of a group (G3), chosen from:
• methyl, ethyl, propyl, allyl, phenyl, tetrahydrofuran-2-yl, furan-2-yl, thiophen-2-yl, pyridinyl, piperazin-2-yl, fluoromethyl, chloromethyl, 2-chloroethyl, methoxymethyl, acetoxymethyl, 1,2-dihydroxyethyl, methoxycarbonyl, 2-carboxyethyl, methoxy, ethoxy, propoxy, allyloxy, 2-chloroethoxy, 2-methoxyethoxy, amino, ethylamino, allylamino, 2-chloroethylamino, pyridylamino, dimethylamino, 1-pyrrolidinyl and 4-morpholinyl;
• R2 and R4, which are identical or different, are each chosen from a hydrogen atom, a halogen atom, and linear and branched, saturated and unsaturated groups comprising from 1-20 carbon atoms, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched groups optionally form at least one 3- to 7-membered ring comprising at least one carbon atom, with the provisos that:
• (i) said R2 and said R4 do not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• (ii) said R4 is chosen from a group other than a hydroxyl group, a thio group, an amino group, and a substituted or unsubstituted sulphonylamino group;
• and
• (iii) said R2 and said R4 are not directly linked to the benzene ring of formula (I) by a —NH—NH—;
• wherein
• said R1 and said R2 optionally form a saturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the proviso that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• wherein
• said R2 and said R5 optionally form a saturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the provisos that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• and
• (ii) when said R2 and said R5 form a saturated ring comprising 5- to 7-members, said R5 optionally is a bond;
• wherein
• said R2 and said R6 optionally form a saturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the provisos that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• and
• (ii) when said R2 and said R6 form a saturated ring comprising 5- to 7-members, said R6 optionally is a bond;
• Y is chosen from:
• a hydrogen atom;
• a halogen atom;
• a group chosen from —OR8, —SR8, and —NH—SO2R8, wherein
• R8 is chosen from:
• linear and branched C1-C8 alkyl groups, optionally substituted with at least one group chosen from a halogen atom, a hydroxyl group, C1-C4 alkoxy groups, an amino group, amino(C1-C4 alkyl) groups, a carboxyl group, and C1-C4 alkoxycarbonyl groups, wherein at least one branch of said branched C1-C8 alkyl groups optionally forms at least one 3- to 6-membered ring;
• a phenyl group, optionally substituted with one or two groups chosen from C1-C4 alkyl groups, a trifluoromethyl group, a carboxyl group, C1-C4 alkoxycarbonyl groups, a halogen atom, a hydroxyl group, C1-C4 alkoxy groups, an amino group and amino(C1-C4 alkyl) groups;
• and
• a benzyl group, optionally substituted with one or two oxy groups, with the proviso that:
• (i) when R2 is a hydroxyl group, Y is not a —NH—SO2R8 group;
• provided that:
• (i) when said R2 and said R4 are hydrogen atoms, and when said R3 is chosen from substituted and unsubstituted C1-C4 alkyl groups, X is not a an —OR5 group, wherein R5 is chosen from substituted and unsubstituted C1-C4 alkyl groups;
• (ii) when said R2 and said R4 are hydrogen atoms, and when said R3 is chosen from substituted and unsubstituted C1-C4 alkyl groups, X is not a NR6R7 group;
• and
• (iii) when said R2, said R4, and said Y, are hydrogen atoms, and when said X is a NR6R7 group, wherein said R6 and R7 are hydrogen atoms, said R3 is not chosen from a fluorine atom, a chlorine atom and a bromine atom.

A composition for oxidation dyeing keratinous fibers comprising, in a medium suitable for dyeing:

• (a) at least one oxidation base;
• and
• (b) at least one coupler chosen from compounds of formula (I) and acid addition salts thereof:
• wherein:
• R1 is chosen from a hydrogen atom, linear and branched, saturated and unsaturated groups comprising from 1-15 carbon atoms, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched groups optionally forms at least one 3- to 7-membered ring comprising at least one carbon atom, with the provisos that:
• (i) said R1 does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group, and
• (ii) said SO2 group is not directly linked to the nitrogen at the 7-position of formula (I);
• X is chosen from groups OR5 and NR6R7, wherein
• R5 is chosen from linear and branched, saturated and unsaturated groups comprising from 1-20 carbon atoms, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched groups optionally forms at least one 3- to 7-membered ring comprising at least one carbon atom, with the proviso that:
• (i) said R5 does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• R6 and R7, which are identical or different, are each chosen from a hydrogen atom, linear and branched, saturated and unsaturated groups comprising from 1-20 carbon atoms, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched groups optionally forms at least one 3- to 7-membered ring comprising at least one carbon atom, with the proviso that:
• (i) both said R6 and R7 do not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group, and
• said R6 and R7 optionally form a ring chosen from a saturated and an unsaturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R, wherein
• R is chosen from linear, branched, saturated, and unsaturated, C1-C6 alkyl groups, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched C1-C6 alkyl group optionally forms at least one saturated or unsaturated 3- to 6-membered ring;
• with the proviso that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• wherein
• said R1 and said R5 optionally form a ring chosen from a saturated and an unsaturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the proviso that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• and
• said R1 and said R6 optionally form a ring, chosen from a saturated and an unsaturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the proviso that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• R2 and R3, which are identical or different, are each chosen from a hydrogen atom, a halogen atom, and linear and branched, saturated and unsaturated groups comprising from 1-20 carbon atoms, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched groups optionally form at least one 3- to 7-membered ring comprising at least one carbon atom, with the provisos that:
• (i) said R2 and R3 do not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• (iii) said R2 and R3 are not directly linked to the benzene ring of formula (I) by a —NH—NH—;
• wherein
• said R1 and said R2 optionally form a saturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the proviso that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• R4 is chosen from:
• a hydrogen atom;
• a halogen atom;
• a group chosen from Group A1, Group A4 and Group A5 as defined below;
• a group chosen from Group A1, Group A2, Group A3, Group A4 and Group A5, as defined below, wherein said groups are attached to the phenolic nucleus in formula (I) by way of a group chosen from an oxygen atom;
• a sulfur atom and a group chosen from —NH—, —Nalkyl(C1-C3)—, —O(CO)—, —NH(CO)—, —Nalkyl(C1-C3)(CO)—, —NH[C═NH]—, —NH(CO)NH—, —NH(CO)Nalkyl(C1-C3)— and —NH(CO)O—;
• wherein:
• said Group A1 is chosen from a hydroxyl gruop, a dimethylamino group, and linear and branched C1-C8 alkyl groups optionally unsaturated and optionally substituted with at least one unit chosen from:
• a Group A2, A4, or A5 as defined below;
• one or two groups, which are identical or different, chosen from N—(C1-C3)alkylamino, N—(C1-C3)alkyl-N—(C1-C3)alkylamino, (C1-C6)alkoxy, oxo, alkoxycarbonyl, acyloxy, amide, acylamino, ureyl, sulphoxy, sulphonyl, sulphonamido, sulphonylamino, bromo, cyano, amino, and carboxyl;
• and one or more groups chosen from a hydroxyl group, a fluoro group, and a chloro group;
• said Group A2, is an aromatic group chosen from a phenyl group, and a naphthyl group, wherein said aromatic group is optionally substituted with one to three groups, which are identical or different, chosen from methyl, trifluoromethyl, ethyl, isopropyl, butyl, pentyl, fluoro, chloro, bromo, methoxy, trifluoromethoxy, ethoxy, propyloxy, acetyloxy, acetyl, amino, oxy, and cyano;
• said Group A3, is a heteroaromatic group chosen from
• furanyl, thiophenyl, pyrrolyl, imidazolyl, thiazolyl, oxazolyl, 1,2,3-triazolyl, 1,2,4-triazolyl, isoxazolyl, isothiazolyl, pyrazolyl, pyrazolotriazolyl, pyrazoloimidazolyl, pyrrolotriazolyl, pyrazolopyrimidyl, pyrazolopyridyl, pyridyl, pyrimidyl, benzoimidazolyl, benzoxazolyl, benzothiazolyl, indolyl, indolidinyl, isoindolyl, indazolyl, benzotriazolyl, quinolinyl, benzoimidazolyl and benzopyrimidyl, wherein said heteroaromatic group is optionally substituted with 1 to 3 groups chosen from linear and branched C1-C4 alkyl groups, a C1-C4 monohydroxyalkyl group, a C2-C4 polyhydroxyalkyl group, a carboxyl group, an alkoxycarbonyl group, an amido group, an amino group, a hydroxyl group, and a halogen atom;
• said Group A4 is chosen from C3-C7 cycloalkyl and norbornyl;
• wherein said C3-C7 cycloalkyl group and said norbornyl group further comprise at least one double bond, and wherein said C3-C7 cycloalkyl group and said norbornyl group are optionally substituted with 1 or 2 units chosen from linear and branched C1-C4 alkyl groups, a C1-C4 monohydroxyalkyl group, a C2-C4 polyhydroxyalkyl group, a carboxyl group, an alkoxycarbonyl group, an amido group, an amino group, a hydroxyl group, an oxy group, and a halogen atom;
• and
• said Group A5 is a heterocycle chosen from dihydrofuranyl;
• tetrahydrofuranyl;
• butyrolactonyl;
• dihydrothiophenyl;
• tetrahydrothiophenyl;
• tetrahydrothiophenonyl;
• iminothiolane;
• dihydropyrrolyl;
• pyrrolidinyl;
• pyrrolidinonyl;
• imidazolidinonyl;
• imidazolidinethionyl;
• oxazolidinyl;
• oxazolidinonyl;
• oxazolanethione;
• thiazolidinyl;
• isothiazolonyl;
• mercaptothiazolinyl;
• pyrazolidinonyl;
• iminothiolane;
• dioxolanyl;
• pentalactone;
• dioxanyl;
• dihydropyridinyl;
• piperidinyl;
• pentalactam;
• morpholinyl;
• pyrazoli(di)nyl;
• pyrimi(di)nyl;
• pyrazinyl;
• piperazinyl;
• and azepinyl;
• wherein
• said R2 and said R5 optionally form a saturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the provisos that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• and
• (ii) when said R2 and said R5 form a saturated ring comprising 5- to 7-members, said R5 optionally is a bond;
• wherein
• said R2 and said R6 optionally form a saturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the provisos that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• and
• (ii) when said R2 and said R6 form a saturated ring comprising 5- to 7-members, said R6 optionally is a bond;
• Y is chosen from:
• a hydrogen atom;
• a halogen atom;
• a group chosen from —OR8, —SR8, and —NH—SO2R8, wherein
• R8 is chosen from:
• linear and branched C1-C8 alkyl groups, optionally substituted with at least one group chosen from a halogen atom, a hydroxyl group, C1-C4 alkoxy groups, an amino group, amino(C1-C4 alkyl) groups, a carboxyl group, and C1-C4 alkoxycarbonyl groups, wherein at least one branch of said branched C1-C8 alkyl groups optionally forms at least one 3- to 6-membered ring;
• a phenyl group, optionally substituted with one or two groups chosen from C1-C4 alkyl groups, a trifluoromethyl group, a carboxyl group, C1-C4 alkoxycarbonyl groups, a halogen atom, a hydroxyl group, C1-C4 alkoxy groups, an amino group and amino(C1-C4 alkyl) groups;
• and
• a benzyl group, optionally substituted with one or two oxy groups, with the proviso that:
• (i) when R2 is a hydroxyl group, Y is not a —NH—SO2R8 group;
• provided that:
• (i) when said R2 and said R4 are hydrogen atoms, and when said R3 is chosen from substituted and unsubstituted C1-C4 alkyl groups, X is not a an —OR5 group, wherein R5 is chosen from substituted and unsubstituted C1-C4 alkyl groups;
• (ii) when said R2 and said R4 are hydrogen atoms, and when said R3 is chosen from substituted and unsubstituted C1-C4 alkyl groups, X is not a NR6R7 group;
• and
• (iii) when said R2, said R4, and said Y, are hydrogen atoms, and when said X is a NR6R7 group, wherein said R6 and R7 are hydrogen atoms, said R3 is not chosen from a fluorine atom, a chlorine atom and a bromine atom.

A composition for oxidation dyeing keratinous fibers comprising, in a medium suitable for dyeing:

• (a) at least one oxidation base;
• and
• (b) at least one coupler chosen from compounds of formula (I) and acid addition salts thereof:
• wherein:
• R1 is chosen from a hydrogen atom, linear and branched, saturated and unsaturated groups comprising from 1-15 carbon atoms, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched groups optionally forms at least one 3- to 7-membered ring comprising at least one carbon atom, with the provisos that:
• (i) said R1 does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group, and
• (ii) said SO2 group is not directly linked to the nitrogen at the 7-position of formula (I);
• X is chosen from groups OR5 and NR6R7, wherein
• R5 is chosen from linear and branched, saturated and unsaturated groups comprising from 1-20 carbon atoms, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched groups optionally forms at least one 3- to 7-membered ring comprising at least one carbon atom, with the proviso that:
• (i) said R5 does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• R6 and R7, which are identical or different, are each chosen from a hydrogen atom, linear and branched, saturated and unsaturated groups comprising from 1-20 carbon atoms, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched groups optionally forms at least one 3- to 7-membered ring comprising at least one carbon atom, with the proviso that:
• (i) both said R6 and R7 do not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group, and
• said R6 and R7 optionally form a ring chosen from a saturated and an unsaturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R, wherein
• R is chosen from linear, branched, saturated, and unsaturated, C1-C6 alkyl groups, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched C1-C6 alkyl group optionally forms at least one saturated or unsaturated 3- to 6-membered ring;
• with the proviso that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• wherein
• said R1 and said R5 optionally form a ring chosen from a saturated and an unsaturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the proviso that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• and
• said R1 and said R6 optionally form a ring, chosen from a saturated and an unsaturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the proviso that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• R2 and R3, which are identical or different, are each chosen from a hydrogen atom, a halogen atom, and linear and branched, saturated and unsaturated groups comprising from 1-20 carbon atoms, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched groups optionally form at least one 3- to 7-membered ring comprising at least one carbon atom, with the provisos that:
• (i) said R2 and said R3 do not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• and
• (ii) said R2 and said R3 are not directly linked to the benzene ring of formula (I) by a —NH—NH—;
• R4 is chosen from:
• an atom chosen from hydrogen, chlorine, fluorine, and bromine,
• a group chosen from methyl, trifluoromethyl, allyl, hydroxymethyl, methoxymethyl, 2-hydroxyethyl, aminomethyl, methylaminomethyl, methoxy, acetoxy and methylamino;
• and
• a group —NH(CO)R15 wherein R15 is a unit of a group (G1), chosen from
• methyl, ethyl, propyl, isopropyl, butyl, isobutyl, tert-butyl, pentyl, isopentyl, neopentyl, hexyl;
• cyclopropyl, cyclobutyl, cyclopentyl, cyclopentylmethyl, 3-cyclopentylpropyl, cyclohexyl, 2-cyclohexylethyl, norborn-2-yl, vinyl, 1-methylvinyl, 2-methylvinyl, 2,2-dimethylvinyl, allyl, 3-butenyl;
• phenyl, methylphenyl, dimethylphenyl, 2,4,6-trimethylphenyl, 4-ethylphenyl, (trifluoromethyl)phenyl, hydroxyphenyl, methoxyphenyl, ethoxyphenyl, acetoxyphenyl, (trifluoromethoxy)phenyl, aminophenyl, 4-dimethylaminophenyl, fluorophenyl, difluorophenyl, fluoro(trifluoromethyl)phenyl, chlorophenyl, dichlorophenyl, bromophenyl, naphth-1-yl, naphth-2-yl, (2-methoxy)naphth-1-yl, benzyl, 4′-methoxybenzyl, 2′,5′-dimethoxybenzyl, 3′,4′-dimethoxybenzyl, 4′-fluorobenzyl, 4′-chlorobenzyl, phenethyl, 2-phenylvinyl, (1-naphthyl)methyl, (2-naphthyl)methyl;
• tetrahydrofuran-2-yl, furan-2-yl, 5-methyl-2-(trifluoromethyl)furan-3-yl, 2-methyl-5-phenylfuran-3-yl, thiophen-2-yl, (thiophen-2-yl)methyl, 3-chlorothiophen-2-yl, 2,5-dichlorothiophen-3-yl, benzothiophen-2-yl, 3-chlorobenzothiophen-2-yl, isoxazol-5-yl, 5-methylisoxazol-3-yl, 3,5-dimethylisoxazol-4-yl, 1,3-dimethylpyrazol-5-yl, 1-ethyl-3-methylpyrazol-5-yl, 1-tert-butyl-3-methylpyrazol-5-yl, 3-tert-butyl-1-methylpyrazol-5-yl, 4-bromo-1-ethyl-3-methylpyrazol-5-yl, indol-3-ylcarboxyl, pyridinyl, chloropyridinyl, dichloropyridinyl, 5-(bromo)pyridin-3-yl, piperazin-2-yl, quinoxal-2-yl;
• fluoromethyl, difluoromethyl, trifluoromethyl, 1,1,2,2-tetrafluoroethyl, pentafluoroethyl, heptafluoropropyl, 1,1,2,2,3,3,4,4-octafluorobutyl, nonafluorobutyl, chloromethyl, chloroethyl, 1,1-dimethyl-2-chloroethyl, 1,2-dichloroethyl, 1-chloropropyl, 3-chloropropyl, 4-chlorobutyl, hydroxymethyl, methoxymethyl, phenoxymethyl, (4-chlorophenoxy)methyl, benzyloxymethyl, acetoxymethyl, 1,2-dihydroxyethyl, 1-phenoxyethyl, 1-acetoxyethyl, 2-(2-carboxyethoxy)ethyl, 1-phenoxyethyl, 1-acetoxyethyl, methoxycarbonyl, ethoxycarbonyl, (methoxycarbonyl)methyl, 2-carboxyethyl, 2-(methoxycarbonyl)ethyl, 2-carboxycyclopropyl, 2-carboxycyclohexane;
• methoxy, ethoxy, propoxy, isopropoxy, butoxy, isobutoxy, pentoxy, neopentoxy, hexyloxy, cyclopentyloxy, cyclohexyloxy, vinyloxy, allyloxy, propargyloxy, chloromethoxy, 2-chloroethoxy, 1-chloroethoxy, 2-methoxyethoxy, 4-chlorobutoxy, phenoxy, 4-methylphenoxy, 4-fluorophenoxy, 4-bromophenoxy, 4-chlorophenoxy, 4-methoxyphenoxy, naphth-2-yloxy, benzyloxy;
• amino, methylamino, ethylamino, propylamino, isopropylamino, butylamino, cyclohexylamino, allylamino, 2-chloroethylamino, 3-chloropropylamino, carboxymethylamino, phenylamino, fluorophenylamino, (trifluoromethyl)phenylamino, chlorophenylamino, bromophenylamino, 4-acetylphenylamino, methoxyphenylamino, (trifluoromethoxy)phenylamino, naphth-1-ylamino, benzylamino, phenethylamino, pyridylamino, pyrid-3-ylamino, dimethylamino, 1-pyrrolidinyl and 4-morpholinyl;
• wherein
• said R1 and said R2 optionally form a saturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the proviso that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• wherein
• said R2 and said R5 optionally form a saturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the provisos that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• and
• (ii) when said R2 and said R5 form a saturated ring comprising 5- to 7-members, said R5 optionally is a bond;
• wherein
• said R2 and said R6 optionally form a saturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the provisos that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• and
• (ii) when said R2 and said R6 form a saturated ring comprising 5- to 7-members, said R6 optionally is a bond;
• Y is chosen from:
• a hydrogen atom;
• a halogen atom;
• a group chosen from —OR8, —SR8, and —NH—SO2R8, wherein
• R8 is chosen from:
• linear and branched C1-C8 alkyl groups, optionally substituted with at least one group chosen from a halogen atom, a hydroxyl group, C1-C4 alkoxy groups, an amino group, amino(C1-C4 alkyl) groups, a carboxyl group, and C1-C4 alkoxycarbonyl groups, wherein at least one branch of said branched C1-C8 alkyl groups optionally forms at least one 3- to 6-membered ring;
• a phenyl group, optionally substituted with one or two groups chosen from C1-C4 alkyl groups, a trifluoromethyl group, a carboxyl group, C1-C4 alkoxycarbonyl groups, a halogen atom, a hydroxyl group, C1-C4 alkoxy groups, an amino group and amino(C1-C4 alkyl) groups;
• and
• a benzyl group, optionally substituted with one or two oxy groups, with the proviso that:
• (i) when R2 is a hydroxyl group, Y is not a —NH—SO2R8 group;
• provided that:
• (i) when said R2 and said R4 are hydrogen atoms, and when said R3 is chosen from substituted and unsubstituted C1-C4 alkyl groups, X is not a an —OR5 group, wherein R5 is chosen from substituted and unsubstituted C1-C4 alkyl groups;
• (ii) when said R2 and said R4 are hydrogen atoms, and when said R3 is chosen from substituted and unsubstituted C1-C4 alkyl groups, X is not a NR6R7 group;
• and
• (iii) when said R2, said R4, and said Y, are hydrogen atoms, and when said X is a NR6R7 group, wherein said R6 and R7 are hydrogen atoms, said R3 is not chosen from a fluorine atom, a chlorine atom and a bromine atom.

A composition for oxidation dyeing keratinous fibers comprising, in a medium suitable for dyeing:

• (a) at least one oxidation base;
• and
• (b) at least one coupler chosen from compounds of formula (I) and acid addition salts thereof:
• wherein:
• R1 is chosen from a hydrogen atom, linear and branched, saturated and unsaturated groups comprising from 1-15 carbon atoms, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched groups optionally forms at least one 3- to 7-membered ring comprising at least one carbon atom, with the provisos that:
• (i) said R1 does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group, and
• (ii) said SO2 group is not directly linked to the nitrogen at the 7-position of formula (I);
• X is chosen from groups OR5 and NR6R7, wherein
• R5 is chosen from linear and branched, saturated and unsaturated groups comprising from 1-20 carbon atoms, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched groups optionally forms at least one 3- to 7-membered ring comprising at least one carbon atom, with the proviso that:
• (i) said R5 does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• R6 and R7, which are identical or different, are each chosen from a hydrogen atom, linear and branched, saturated and unsaturated groups comprising from 1-20 carbon atoms, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched groups optionally forms at least one 3- to 7-membered ring comprising at least one carbon atom, with the proviso that:
• (i) both said R6 and R7 do not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group, and
• said R6 and R7 optionally form a ring chosen from a saturated and an unsaturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R, wherein
• R is chosen from linear, branched, saturated, and unsaturated, C1-C6 alkyl groups, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched C1-C6 alkyl group optionally forms at least one saturated or unsaturated 3- to 6-membered ring;
• with the proviso that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• wherein
• said R1 and said R5 optionally form a ring chosen from a saturated and an unsaturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the proviso that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• and
• said R1 and said R6 optionally form a ring, chosen from a saturated and an unsaturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the proviso that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• R2 and R3, which are identical or different, are each chosen from a hydrogen atom, a halogen atom, and linear and branched, saturated and unsaturated groups comprising from 1-20 carbon atoms, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched groups optionally form at least one 3- to 7-membered ring comprising at least one carbon atom, with the provisos that:
• (i) said R2 and said R3 do not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• and
• (ii) said R2 and said R3 are not directly linked to the benzene ring of formula (I) by a —NH—NH—;
• R4 is chosen from:
• an atom chosen from hydrogen, chlorine, and fluorine;
• a group chosen from methyl, hydroxymethyl, aminomethyl, methoxy and methylamino;
• and
• a group —NH(CO)R16 wherein R16 is a unit of a group (G3), chosen from:
• methyl, ethyl, propyl, allyl, phenyl, tetrahydrofuran-2-yl, furan-2-yl, thiophen-2-yl, pyridinyl, piperazin-2-yl, fluoromethyl, chloromethyl, 2-chloroethyl, methoxymethyl, acetoxymethyl, 1,2-dihydroxyethyl, methoxycarbonyl, 2-carboxyethyl, methoxy, ethoxy, propoxy, allyloxy, 2-chloroethoxy, 2-methoxyethoxy, amino, ethylamino, allylamino, 2-chloroethylamino, pyridylamino, dimethylamino, 1-pyrrolidinyl and 4-morpholinyl;
• wherein
• said R1 and said R2 optionally form a saturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the proviso that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• wherein
• said R2 and said R5 optionally form a saturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the provisos that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• and
• (ii) when said R2 and said R5 form a saturated ring comprising 5- to 7-members, said R5 optionally is a bond;
• wherein
• said R2 and said R6 optionally form a saturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the provisos that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• and
• (ii) when said R2 and said R6 form a saturated ring comprising 5- to 7-members, said R6 optionally is a bond;
• Y is chosen from:
• a hydrogen atom;
• a halogen atom;
• a group chosen from —OR8, —SR8, and —NH—SO2R8, wherein
• R8 is chosen from:
• linear and branched C1-C8 alkyl groups, optionally substituted with at least one group chosen from a halogen atom, a hydroxyl group, C1-C4 alkoxy groups, an amino group, amino(C1-C4 alkyl) groups, a carboxyl group, and C1-C4 alkoxycarbonyl groups, wherein at least one branch of said branched C1-C8 alkyl groups optionally forms at least one 3- to 6-membered ring;
• a phenyl group, optionally substituted with one or two groups chosen from C1-C4 alkyl groups, a trifluoromethyl group, a carboxyl group, C1-C4 alkoxycarbonyl groups, a halogen atom, a hydroxyl group, C1-C4 alkoxy groups, an amino group and amino(C1-C4 alkyl) groups;
• and
• a benzyl group, optionally substituted with one or two oxy groups, with the proviso that:
• (i) when R2 is a hydroxyl group, Y is not a —NH—SO2R8 group;
• provided that:
• (i) when said R2 and said R4 are hydrogen atoms, and when said R3 is chosen from substituted and unsubstituted C1-C4 alkyl groups, X is not a an —OR5 group, wherein R5 is chosen from substituted and unsubstituted C1-C4 alkyl groups;
• (ii) when said R2 and said R4 are hydrogen atoms, and when said R3 is chosen from substituted and unsubstituted C1-C4 alkyl groups, X is not a NR6R7 group;
• and
• (iii) when said R2, said R4, and said Y, are hydrogen atoms, and when said X is a NR6R7 group, wherein said R6 and R7 are hydrogen atoms, said R3 is not chosen from a fluorine atom, a chlorine atom and a bromine atom.

A composition for oxidation dyeing keratinous fibers comprising, in a medium suitable for dyeing:

• (a) at least one oxidation base;
• and
• (b) at least one coupler chosen from compounds of formula (I) and acid addition salts thereof:
• wherein at least one coupler of formula (I) is chosen from the Groups (i), (ii), (iii), and (iv) in which:
• Group (i) is said at least one coupler of formula (I) wherein:
• R1 is a hydrogen atom;
• X is a group chosen from methoxy, ethoxy, propyloxy, isopropyloxy, butyloxy, isobutyloxy, 2-hydroxyethoxy, 2-methoxyethoxy, allyloxy, amino, methylamino, ethylamino, propylamino, isopropylamino, butylamino, isobutylamino, 2-hydroxyethylamino, 2-methoxyethylamino, 3-hydroxypropylamino, 2,3-dihydroxypropylamino, allylamino, dimethylamino, diethylamino, di(2-hydroxyethyl)amino, pyrrolidin-1-yl, 3-hydroxypyrrolidin-1-yl, and 3,4-dihydroxypyrrolidin-1-yl;
• R2 is chosen from:
• a group chosen from hydroxyl, amino, methylamino, 2-hydroxyethylamino and diethylamino;
• a group —NH(CO)R17, wherein R17 is a unit of group (G4), said unit is chosen from a methyl group, a methoxymethyl group, a 2-carboxyethyl group, a methoxy group, an amino group, an ethylamino group, a 1-pyrrolidinyl group;
• a methanesulphonylamino group, an ethanesulphonylamino group, and a dimethylaminosulphonylamino group;
• R3 is chosen from a hydrogen atom, a chlorine atom, and a methyl group;
• R4 is chosen from a hydrogen atom, a chlorine atom, a fluorine atom, and a methyl group;
• and
• Y is chosen from a hydrogen atom, a chlorine atom, a methoxy group, and a —OCH2(CO)OCH3 group;
• Group (ii) is said at least one coupler of formula (I) wherein:
• R1 is a hydrogen atom;
• X is a group chosen from methoxy, ethoxy, propyloxy, isopropyloxy, butyloxy, isobutyloxy, 2-hydroxyethoxy, 2-methoxyethoxy, allyloxy, amino, methylamino, ethylamino, propylamino, isopropylamino, butylamino, isobutylamino, 2-hydroxyethylamino, 2-methoxyethylamino, 3-hydroxypropylamino, 2,3-dihydroxypropylamino, allylamino, dimethylamino, diethylamino, di(2-hydroxyethyl)amino, pyrrolidin-1-yl, 3-hydroxypyrrolidin-1-yl, and 3,4-dihydroxypyrrolidin-1-yl;
• R2 is chosen from a hydrogen atom and a methyl group;
• R3 is chosen from:
• a group chosen from hydroxyl, amino, methylamino, 2-hydroxyethylamino, diethylamino, methanesulphonylamino, ethanesulphonylamino and dimethylaminosulphonylamino;
• and
• a group —NH(CO)R18, wherein R18 is a moiety of group (G4), said moiety is chosen from a methyl group, a methoxymethyl group, a 2-carboxyethyl group, a methoxy group, an amino group, an ethylamino group, a 1-pyrrolidinyl group, a methanesulphonylamino group, an ethanesulphonylamino group, and a dimethylaminosulphonylamino group;
• R4 is chosen from a hydrogen atom, a chlorine atom, a fluorine atom, and a methyl group;
• and
• Y is chosen from a hydrogen atom, a chlorine atom, a methoxy group, and a —OCH2(CO)OCH3 group;
• Group (iii) is said at least one coupler of formula (I) wherein:
• R1 is a hydrogen atom;
• X is a group chosen from methoxy, ethoxy, propyloxy, isopropyloxy, butyloxy, isobutyloxy, 2-hydroxyethoxy, 2-methoxyethoxy, allyloxy, amino, methylamino, ethylamino, propylamino, isopropylamino, butylamino, isobutylamino, 2-hydroxyethylamino, 2-methoxyethylamino, 3-hydroxypropylamino, 2,3-dihydroxypropylamino, allylamino, dimethylamino, diethylamino, di(2-hydroxyethyl)amino, pyrrolidin-1-yl, 3-hydroxypyrrolidin-1-yl, and 3,4-dihydroxypyrrolidin-1-yl;
• R2 is chosen from a hydrogen atom, and a methyl group;
• R3 is chosen from a hydrogen atom, a chlorine atom, a methyl group, a methoxy group and a methylamino group;
• R4 is chosen from a group —NH(CO)R19, wherein R19 is a unit of group (G4), said unit is chosen from a methyl group, a methoxymethyl group, a 2-carboxyethyl group, a methoxy group, an amino group, an ethylamino group, a 1-pyrrolidinyl group;
• a methanesulphonylamino group, an ethanesulphonylamino group, and a dimethylaminosulphonylamino group;
• and
• Y is chosen from a hydrogen atom, a chlorine atom, a methoxy group, and a —OCH2(CO)OCH3 group;
• and
• Group (iv) is said at least one coupler of formula (I) wherein:
• R1 is a hydrogen atom;
• X is a group chosen from methoxy, ethoxy, propyloxy, isopropyloxy, butyloxy, isobutyloxy, 2-hydroxyethoxy, 2-methoxyethoxy, allyloxy, amino, methylamino, ethylamino, propylamino, isopropylamino, butylamino, isobutylamino, 2-hydroxyethylamino, 2-methoxyethylamino, 3-hydroxypropylamino, 2,3-dihydroxypropylamino, allylamino, dimethylamino, diethylamino, di(2-hydroxyethyl)amino, pyrrolidin-1-yl, 3-hydroxypyrrolidin-1-yl, and 3,4-dihydroxypyrrolidin-1-yl;
• R2 is chosen from a hydrogen atom and a methyl group;
• R3 is chosen from a hydrogen atom, a methyl group and an ethyl group;
• R4 is chosen from a hydrogen atom, a chlorine atom, and a fluorine atom;
• and
• Y is chosen from a hydrogen atom, a chlorine atom and a —OCH2(CO)OCH3 group
• provided that:
• (i) when said R2 and said R4 are hydrogen atoms, and when said R3 is chosen from substituted and unsubstituted C1-C4 alkyl groups, X is not a —OR5 group, wherein R5 is chosen from substituted and unsubstituted C1-C4 alkyl groups;
• (ii) when said R2 and said R4 are hydrogen atoms, and when said R3 is chosen from substituted and unsubstituted C1-C4 alkyl groups, X is not a NR6R7 group;
• and
• (iii) when said R2, said R4, and said Y are hydrogen atoms, and when said X is a NR6R7 group, wherein said R6 and R7 are hydrogen atoms, said R3 is not chosen from a fluorine atom, a chlorine atom and a bromine atom.

A process for oxidation dyeing keratinous fibers comprising:

• (1) applying to said fibers at least one dyeing composition comprising, in a medium suitable for dyeing:
• (a) at least one oxidation base;
• and
• (b) at least one coupler chosen from compounds of formula (I) and acid addition salts thereof:
• wherein:
• R1 is chosen from a hydrogen atom, linear and branched, saturated and unsaturated groups comprising from 1-15 carbon atoms, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched groups optionally forms at least one 3- to 7-membered ring comprising at least one carbon atom, with the provisos that:
• (i) said R1 does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group, and
• (ii) said SO2 group is not directly linked to the nitrogen at the 7-position of formula (I);
• X is chosen from groups OR5 and NR6R7, wherein
• R5 is chosen from linear and branched, saturated and unsaturated groups comprising from 1-20 carbon atoms, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched groups optionally forms at least one 3- to 7-membered ring comprising at least one carbon atom, with the proviso that:
• (i) said R5 does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• R6 and R7, which are identical or different, are each chosen from a hydrogen atom, linear and branched, saturated and unsaturated groups comprising from 1-20 carbon atoms, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched groups optionally forms at least one 3- to 7-membered ring comprising at least one carbon atom, with the proviso that:
• (i) both said R6 and R7 do not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group, and
• said R6 and R7 optionally form a ring chosen from a saturated and an unsaturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R, wherein
• R is chosen from linear, branched, saturated, and unsaturated, C1-C6 alkyl groups, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched C1-C6 alkyl group optionally forms at least one saturated or unsaturated 3- to 6-membered ring;
• with the proviso that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• wherein
• said R1 and said R5 optionally form a ring chosen from a saturated and an unsaturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the proviso that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• and
• said R1 and said R6 optionally form a ring, chosen from a saturated and an unsaturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the proviso that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• R2, R3 and R4, which are identical or different, are each chosen from a hydrogen atom, a halogen atom, and linear and branched, saturated and unsaturated groups comprising from 1-20 carbon atoms, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched groups optionally form at least one 3- to 7-membered ring comprising at least one carbon atom, with the provisos that:
• (i) said R2, R3 and R4 do not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• (ii) said R4 is chosen from a group other than a hydroxyl group, a thio group, an amino group, and a substituted or unsubstituted sulphonylamino group;
• and
• (iii) said R2, R3 and R4 are not directly linked to the benzene ring of formula (I) by a —NH—NH—;
• wherein
• said R1 and said R2 optionally form a saturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the proviso that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• wherein
• said R2 and said R5 optionally form a saturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the provisos that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• and
• (ii) when said R2 and said R5 form a saturated ring comprising 5- to 7-members, said R5 optionally is a bond;
• wherein
• said R2 and said R6 optionally form a saturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the provisos that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• and
• (ii) when said R2 and said R6 form a saturated ring comprising 5- to 7-members, said R6 optionally is a bond;
• Y is chosen from:
• a hydrogen atom;
• a halogen atom;
• a group chosen from —OR8, —SR8, and —NH—SO2R8, wherein
• R8 is chosen from:
• linear and branched C1-C8 alkyl groups, optionally substituted with at least one group chosen from a halogen atom, a hydroxyl group, C1-C4 alkoxy groups, an amino group, amino(C1-C4 alkyl) groups, a carboxyl group, and C1-C4 alkoxycarbonyl groups, wherein at least one branch of said branched C1-C8 alkyl groups optionally forms at least one 3- to 6-membered ring;
• a phenyl group, optionally substituted with one or two groups chosen from C1-C4 alkyl groups, a trifluoromethyl group, a carboxyl group, C1-C4 alkoxycarbonyl groups, a halogen atom, a hydroxyl group, C1-C4 alkoxy groups, an amino group and amino(C1-C4 alkyl) groups;
• and
• a benzyl group, optionally substituted with one or two oxy groups, with the proviso that:
• (i) when R2 is a hydroxyl group, Y is not a —NH—SO2R8 group;
• provided that:
• (i) when said R2 and said R4 are hydrogen atoms, and when said R3 is chosen from substituted and unsubstituted C1-C4 alkyl groups, X is not a an —OR5 group, wherein R5 is chosen from substituted and unsubstituted C1-C4 alkyl groups;
• (ii) when said R2 and said R4 are hydrogen atoms, and when said R3 is chosen from substituted and unsubstituted C1-C4 alkyl groups, X is not a NR6R7 group;
• and
• (iii) when said R2, said R4, and said Y, are hydrogen atoms, and when said X is a NR6R7 group, wherein said R6 and R7 are hydrogen atoms, said R3 is not chosen from a fluorine atom, a chlorine atom and a bromine atom;
• and
• (2) developing a color with at least one oxidizing agent,
• wherein said oxidizing agent is combined at the time of use with said at least one dyeing compostion or said at least one oxidizing agent is applied simultaneously or sequentially to said at least one dyeing composition.

A process for oxidation dyeing keratinous fibers comprising:

• (1) applying to said fibers at least one dyeing composition comprising, in a medium suitable for dyeing:
• (a) at least one oxidation base;
• and
• (b) at least one coupler chosen from compounds of formula (I) and acid addition salts thereof:
• in which:
• R1 is chosen from a hydrogen atom, linear and branched, saturated and unsaturated groups comprising from 1-15 carbon atoms, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched groups optionally forms at least one 3- to 7-membered ring comprising at least one carbon atom, with the provisos that:
• (i) said R1 does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group, and
• (ii) said SO2 group is not directly linked to the nitrogen at the 7-position of formula (I);
• X is chosen from groups OR5 and NR6R7, wherein
• R5 is chosen from linear and branched, saturated and unsaturated groups comprising from 1-20 carbon atoms, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched groups optionally forms at least one 3- to 7-membered ring comprising at least one carbon atom, with the proviso that:
• (i) said R5 does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• R6 and R7, which are identical or different, are each chosen from a hydrogen atom, linear and branched, saturated and unsaturated groups comprising from 1-20 carbon atoms, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched groups optionally forms at least one 3- to 7-membered ring comprising at least one carbon atom, with the proviso that:
• (i) both said R6 and R7 do not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group, and
• said R6 and R7 optionally form a ring chosen from a saturated and an unsaturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R, wherein
• R is chosen from linear, branched, saturated, and unsaturated, C1-C6 alkyl groups, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched C1-C6 alkyl group optionally forms at least one saturated or unsaturated 3- to 6-membered ring;
• with the proviso that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• wherein
• said R1 and said R5 optionally form a ring chosen from a saturated and an unsaturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the proviso that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• and
• said R1 and said R6 optionally form a ring, chosen from a saturated and an unsaturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the proviso that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• R2, R3, and R4, which are identical or different, are each chosen from a hydrogen atom, a halogen atom, and linear and branched, saturated and unsaturated groups comprising from 1-20 carbon atoms, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched groups optionally form at least one 3- to 7-membered ring comprising at least one carbon atom, with the provisos that:
• (i) said R2, R3 and R4 do not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• (ii) said R4 is chosen from a group other than a hydroxyl group, a thio group, an amino group, and a substituted or unsubstituted sulphonylamino group;
• and
• (iii) said R2, R3 and R4 are not directly linked to the benzene ring of formula (I) by a —NH—NH—;
• wherein
• said R1 and said R2 optionally form a saturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the proviso that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• wherein
• said R2 and said R5 optionally form a saturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the provisos that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• and
• (ii) when said R2 and said R5 form a saturated ring comprising 5- to 7-members, said R5 optionally is a bond;
• wherein
• said R2 and said R6 optionally form a saturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the provisos that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• and
• (ii) when said R2 and said R6 form a saturated ring comprising 5- to 7-members, said R6 optionally is a bond;
• Y is chosen from:
• a hydrogen atom;
• a halogen atom;
• a group chosen from —OR8, —SR8, and —NH—SO2R8, wherein
• R8 is chosen from:
• linear and branched C1-C8 alkyl groups, optionally substituted with at least one group chosen from a halogen atom, a hydroxyl group, C1-C4 alkoxy groups, an amino group, amino(C1-C4 alkyl) groups, a carboxyl group, and C1-C4 alkoxycarbonyl groups, wherein at least one branch of said branched C1-C8 alkyl group optionally forms at least one 3- to 6-membered ring;
• a phenyl group, optionally substituted with one or two groups chosen from C1-C4 alkyl groups, a trifluoromethyl group, a carboxyl group, C1-C4 alkoxycarbonyl groups, a halogen atom, a hydroxyl group, C1-C4 alkoxy groups, an amino group and amino(C1-C4 alkyl) groups;
• and
• a benzyl group, optionally substituted with one or two oxy groups, with the proviso that:
• (i) when R2 is a hydroxyl group, Y is not a —NH—SO2R8 group;
• provided that:
• (i) when said R2 and said R4 are hydrogen atoms, and when said R3 is chosen from substituted and unsubstituted C1-C4 alkyl groups, X is not a an —OR5 group, wherein R5 is chosen from substituted and unsubstituted C1-C4 alkyl groups;
• (ii) when said R2 and said R4 are hydrogen atoms, and when said R3 is a substituted or unsubstituted C1-C4 alkyl group, X is not a NR6R7 group;
• and
• (iii) when said R2, said R4, and said Y, are hydrogen atoms, and when said X is a NR6R7 group, wherein said R6 and R7 are hydrogen atoms, said R3 is not chosen from a fluorine atom, chlorine atom and a bromine atom;
• and
• (2) developing a color with at least one oxidizing composition comprising, in a medium suitable for dyeing, at least one oxidizing agent present in an amount sufficient to develop a color, wherein said at least one oxidizing composition is combined at the time of use with said at least one dyeing composition,
• (3) leaving said combination to act for a time ranging from 3 to 50 minutes, and
• (4) rinsing said keratinous fibers, shampooing said keratinous fibers after said shampooing, and drying said keratinous fibers.

A kit comprising two compartments, wherein:

• a) a first compartment comprises at least one oxidizing composition;
• and
• b) a second compartment comprises at least one dyeing composition comprising, in a medium suitable for dyeing:
• i) at least one oxidation base, and
• ii) at least one coupler chosen from compounds of formula (I), and acid addition salts thereof:
• in which:
• R1 is chosen from a hydrogen atom, linear and branched, saturated and unsaturated groups comprising from 1-15 carbon atoms, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched groups optionally forms at least one 3- to 7-membered ring comprising at least one carbon atom, with the provisos that:
• (i) said R1 does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group, and
• (ii) said SO2 group is not directly linked to the nitrogen at the 7-position of formula (I);
• X is chosen from groups OR5 and NR6R7, wherein
• R5 is chosen from linear and branched, saturated and unsaturated groups comprising from 1-20 carbon atoms, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched groups optionally forms at least one 3- to 7-membered ring comprising at least one carbon atom, with the proviso that:
• (i) said R5 does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• R6 and R7, which are identical or different, are each chosen from a hydrogen atom, linear and branched, saturated and unsaturated groups comprising from 1-20 carbon atoms, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched groups optionally forms at least one 3- to 7-membered ring comprising at least one carbon atom, with the proviso that:
• (i) both said R6 and R7 do not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group, and
• said R6 and R7 optionally form a ring chosen from a saturated and an unsaturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R, wherein
• R is chosen from linear, branched, saturated, and unsaturated, C1-C6 alkyl groups, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched C1-C6 alkyl group optionally forms at least one saturated or unsaturated 3- to 6-membered ring;
• with the proviso that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• wherein
• said R1 and said R5 optionally form a ring chosen from a saturated and an unsaturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the proviso that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• and
• said R, and said R6 optionally form a ring, chosen from a saturated and an unsaturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the proviso that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• R2, R3, and R4, which are identical or different, are each chosen from a hydrogen atom, a halogen atom, and linear and branched, saturated and unsaturated groups comprising from 1-20 carbon atoms, optionally substituted with at least one halogen atom, wherein at least one carbon atom is optionally replaced by a unit chosen from an oxygen atom, a nitrogen atom, a sulfur atom, and a SO2 group, and at least one branch of said branched groups optionally form at least one 3- to 7-membered ring comprising at least one carbon atom, with the provisos that:
• (i) said R2, R3 R4 do not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• (ii) said R4 is chosen from a group other than a hydroxyl group, a thio group, an amino group, and a substituted or unsubstituted sulphonylamino group;
• and
• (iii) said R2, R3 and R4 are not directly linked to the benzene ring of formula (I) by a —NH—NH—;
• wherein
• said R1 and said R2 optionally form a saturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the proviso that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• wherein
• said R2 and said R5 optionally form a saturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the provisos that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• and
• (ii) when said R2 and said R5 form a saturated ring comprising 5- to 7-members, said R5 optionally is a bond;
• wherein
• said R2 and said R6 optionally form a saturated ring comprising 5- to 7-members, wherein said members are each chosen from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a carbonyl group, and said members are optionally substituted with 1 or 2 groups R as defined above, with the provisos that:
• (i) said R does not comprise a group chosen from a peroxide group, a diazo group, a nitro group, and a nitroso group;
• and
• (ii) when said R2 and said R6 form a saturated ring comprising 5- to 7-members, said R6 optionally is a bond;
• Y is chosen from:
• a hydrogen atom;
• a halogen atom;
• a group chosen from —OR8, —SR8, and —NH—SO2R8, wherein
• R8 is chosen from:
• linear and branched C1-C8 alkyl groups, optionally substituted with at least one group chosen from a halogen atom, a hydroxyl group, C1-C4 alkoxy groups, an amino group, amino(C1-C4 alkyl) groups, a carboxyl group, and C1-C4 alkoxycarbonyl groups, wherein at least one branch of said branched C1-C8 alkyl group optionally forms at least one 3- to 6-membered ring;
• a phenyl group, optionally substituted with one or two groups chosen from C1-C4 alkyl groups, a trifluoromethyl group, a carboxyl group, C1-C4 alkoxycarbonyl groups, a halogen atom, a hydroxyl group, C1-C4 alkoxy groups, an amino group and amino(C1-C4 alkyl) groups;
• and
• a benzyl group, optionally substituted with one or two oxy groups, with the proviso that:
• (i) when R2 is a hydroxyl group, Y is not a —NH—SO2R8 group;
• provided that:
• (i) when said R2 and said R4 are hydrogen atoms, and when said R3 is chosen from substituted and unsubstituted C1-C4 alkyl groups, X is not a an —OR5 group, wherein R5 is chosen from substituted and unsubstituted C1-C4 alkyl groups;
• (ii) when said R2 and said R4 are hydrogen atoms, and when said R3 is a substituted or unsubstituted C1-C4 alkyl group, X is not a NR6R7 group;
• and
• (iii) when said R2, said R4 and said Y, are hydrogen atoms, and when said X is a NR6R7 group, wherein said R6 and R7 are hydrogen atoms, said R3 is not chosen from a fluorine atom, chlorine atom and a bromine atom.