Bleach catalysts

A bleaching composition comprising

• a) from 2% to 80% by weight of H2O2 or a precursor of H2O2;
• and
• b) a compound of formula (1) having the structure
• wherein
• R1, R2, R3, R4 independently from each other are hydrogen, unsubstituted or substituted C1-C28alkyl, C1-C28alkoxy, C2-C28alkenyl, C2-C22alkinyl, C3-C12cycloalkyl, C3-C12cycloalkenyl, C7-C9aralkyl, C3-C20heteroalkyl, C3-C12cycloheteroalkyl, C5-C16heteroaralkyl, unsubstituted or substituted phenyl or napththyl, wherein the substituents for the radicals are selected from the group consisting of C1-C4alkyl;
• C1-C4alkoxy;
• hydroxy;
• sulfo;
• sulfato;
• halogen;
• cyano;
• nitro;
• carboxy;
• amino;
• N-mono- or N,N-di-C1-C4alkylamino unsubstituted or substituted by hydroxy in the alkyl moiety;
• N-phenylamino;
• N-naphthylamino wherein the amino groups may be quaternised;
• phenyl;
• phenoxy or naphthyloxy;
• or R1, R2, R3, R4 independently from each other are OR11, NR11R12, NO2 or halogen;
• or
• R1 and R2, R2 and R3 or R3 and R4 are linked together to form 1, 2 or 3 carbocyclic or heterocyclic rings, which may be uninterrupted or interrupted by one or more —O—, —S— or —NR13— and or which may be further fused with other aromatic rings and/or which may be substituted with one or more C1-C6alkyl groups,
• R5 denotes hydrogen, unsubstituted or substituted C1-C28alkyl, C2-C28alkenyl, C2-C22alkinyl, C3-C12cycloalkyl, C3-C12cycloalkenyl, C7-C9aralkyl, C3-C20heteroalkyl, C3-C12cycloheteroalkyl, C5-C16heteroaralkyl, unsubstituted or substituted phenyl, or unsubstituted or substituted heteroaryl;
• wherein the substituents for the radicals are selected from the group consisting of C1-C4alkyl;
• C1-C4alkoxy;
• hydroxy;
• sulfo;
• sulfato;
• halogen;
• cyano;
• nitro;
• carboxy;
• amino;
• N-mono- or N,N-di-C1-C4alkylamino unsubstituted or substituted by hydroxy in the alkyl moiety;
• N-phenylamino;
• N-naphthylamino wherein the amino groups may be quaternised;
• phenyl;
• phenoxy or naphthyloxy;
• R6 denotes hydrogen, C1-C28alkyl, C2-C28alkenyl, C2-C22alkinyl, C3-C12cycloalkyl, C3-C12cycloalkenyl, C7-C9aralkyl, C3-C20heteroalkyl, C3-C12cycloheteroalkyl, C5-C16heteroaralkyl, unsubstituted or substituted phenyl or naphtyl, or unsubstituted or substituted heteroaryl;
• wherein the substituents for the radicals are selected from the group consisting of C1-C4alkyl;
• C1-C4alkoxy;
• hydroxy;
• sulfo;
• sulfato;
• halogen;
• cyano;
• nitro;
• carboxy;
• amino;
• N-mono- or N,N-di-C1-C4alkylamino unsubstituted or substituted by hydroxy in the alkyl moiety;
• N-phenylamino;
• N-naphthylamino wherein the amino groups may be quaternised;
• phenyl;
• phenoxy or naphthyloxy;
• R7 is a group
• each group with an anion A−;
• k is an integer from 1 to 4;
• A− is the anion of an organic or inorganic acid;
• R10 denotes hydrogen, C1-C28alkyl, C2-C28alkenyl, C2-C22alkinyl, C3-C12cycloalkyl, C3-C12cycloalkenyl, C7-C9aralkyl, C3-C20heteroalkyl, C3-C12cycloheteroalkyl, C5-C16heteroaralkyl;
• R11, R12 independently are hydrogen, C1-C18alkyl or phenyl;
• or R11 and R12 together with the nitrogen atom to which they are bonded form a 5 or 6 membered-ring which may contain a further N, O or S atom,
• R13 denotes hydrogen or C1-C18alkyl.