Reactive azo dyes, their preparation and their use

Reactive dyes of the general formula (1)

• where
• Y is a heterocyclic reactive group of the general formula (2) or (3)
• where
• X1 to X3 are independently hydrogen, cyano or halogen, with the proviso that at least one of X2 and X3 is halogen,
• X4 is chlorine or fluorine,
• X5 is a group of the general formula (4)
• where
• R1 is hydrogen, alkyl, alkoxy, sulfo or chlorine and
• R2 is a radical —SO2CH═CH2 or —SO2CH2CH2Z, where Z is a grouping which can be eliminated by the action of alkali;
• n is 0, 1 or 2,
• B is —CH2—SO3M or hydrogen, and
• M is hydrogen, ammonium, an alkali metal or the equivalent of an alkaline earth metal.