Reactive azo dyes preparaton therof and use thereof

A reactive dye of the general formula (1)

• 64
• where
• Y is a heterocyclic reactive group of the general formula (2) or (3)
• 65
• where
• X1 to X3 are independently hydrogen, cyano or halogen, with the proviso that at least one of X1 to X3 is halogen,
• X4 is chlorine, fluorine or X5,
• X5 is a group of the general formula (4)
• 66
• where
• R1 is hydrogen, alkyl or aryl;
• B is alkylene, arylene or arylalkylene, and B alkylene may be interrupted by an oxygen atom;
• and
• R2 is an SO2CH2CH2Z or SO2CH═CH2 radical, where Z is an alkali-eliminable moiety;
• n is 0 or 1;
• and
• M is hydrogen, ammonium, an alkali metal or the equivalent of an alkaline earth metal,
• subject to the proviso that the dye where Y is a group of the general formula (3) where X4 is chlorine, R1 is hydrogen, B is para-phenylene, n is 0 and the Y—NH— group is disposed meta to the diazo group and also the dyes where Y is a group of the general formula (3) where X4 is chlorine, R1 is hydrogen, B is ethylene and the Y—NH— group is disposed para or meta to the diazo group shall be excluded.