Fiber-reactive azo dyes, preparation thereof and use thereof

Reactive dyes as per the hereinbelow indicated and defined general formula (I),

• where
• D1 and D2 are independently a group of the general formula (1)
• where
• R1 and R2 are independently hydrogen, (C1-C4)-alkyl, (C1-C4)-alkoxy, hydroxyl, sulfo, carboxyl, cyano, nitro, amido, ureido or halogen;
• and
• X1 is hydrogen or a group of the formula —SO2-Z, where
• Z is —CH═CH2, —CH2CH2Z1 or hydroxyl, where
• Z1 is hydroxyl or an alkali-detachable group;
• or
• D1 and D2 are independently a naphthyl group of the general formula (2)
• where
• R3 and R4 are independently hydrogen, (C1-C4)-alkyl, (C1-C4)-alkoxy, hydroxyl, sulfo, carboxyl, cyano, nitro, amido, ureido or halogen;
• and
• X2 has one of the meanings of X1;
• or
• D1 and D2 are independently a group of the general formula (3)
• where
• R5 and R6 independently have one of the meanings of R1 and R2;
• R7 is hydrogen, (C1-C4)-alkyl, unsubstituted or (C1-C4)-alkyl-, (C1-C4)-alkoxy-, sulfo-, halogen- or carboxyl-substituted phenyl;
• and
• Z2 is a heterocyclic reactive radical;
• or
• D1 and D2 are independently a group of the general formula (9)
• where
• R12 is hydrogen, (C1-C4)-alkyl, aryl or a substituted aryl radical;
• R13 and R14 are independently hydrogen, (C1-C4)-alkyl, (C1-C4)-alkoxy, hydroxyl, sulfo, carboxyl, cyano, nitro, amido, ureido or halogen;
• and
• A is a phenylene group of the general formula (10)
• where
• R15 and R16 are independently hydrogen, (C1-C4)-alkyl, (C1-C4)-alkoxy, hydroxyl, sulfo, carboxyl, cyano, nitro, amido, ureido or halogen;
• or
• a naphthylene group of the general formula (11)
• where
• R17 and R18 are independently hydrogen, (C1-C4)-alkyl, (C1-C4)-alkoxy, hydroxyl, sulfo, carboxyl, cyano, nitro, amido, ureido or halogen;
• or
• a polymethylene group of the general formula (12)
• —(CR19R20)k— (12)
• where
• k is a whole number greater than 1 and
• R19 and R20 are independently hydrogen, (C1-C4)-alkyl,
• (C1-C4)-alkoxy, hydroxyl, cyano, amido, halogen or aryl;
• and
• X3 has one of the meanings of X1;
• and
• R, R* are independently hydrogen, (C1-C4)-alkyl or sulfomethyl;
• and
• M is hydrogen, an alkali metal or one equivalent of an alkaline earth metal, with the proviso that the dyes of the general formulae (I) contain at least one fiber-reactive heterocyclic group of the general formula.