New reactive dyes

The invention comprises dyes of the general formula F-Y-A-B in which F denotes the radical of a dye, Y denotes a -NH-, -N = N-, -CO-, -CONH- or 502NH- group and may be combined with an aromatic radical of the dye molecule by further bridge members, A denotes a covalent linkage, an aliphatic radical an araliphatic radical or an aromatic radical which may be annellated with B and B denotes a five-membered heterocyclic ring containing the grouping in which X denotes a radical which can be split off as an anion with the proviso that A and B do not represent the radical of 2-chlorobenzothiazole or 2-chloro-4-hydroxybenzothiazole. In a modification of the above dyes F denotes the radical of a coupling component, Y is -N = N-, A is an aromatic radical and B has the meaning given above. The dyes are prepared by processes wherein (a) an amine of the general formula H2N-A-B in which A and B have the meanings given above is reacted with a dye or dye precursor containing at least one radical capable of reacting with amino groups or with a diazotized amine or the diazonium compound of an amine having the formula given above is reacted with a compound capable of coupling, the reaction product when a dye precursor has been used, being converted to the dye in the conventional way, (b) the dye obtained is treated with a sulphonating agent, or (c) an acid halide of the general formula Z-CO-A-B in which A and B have the meanings given above and Z denotes a halogen atom is reacted with a dye or dye precursor containing an acetylatable amino group and when a dye precursor has been used converting the reaction product into the dye in the conventional way. In examples, a blue dye is obtained when 2-chloro - 6 - aminobenzothiazole is reacted with 1 - amino - 4 - bromanthroquinone - 2 - sulphonic acid and the product is reacted with oleum probably to introduce a sulphonic acid group into the benzothiazole nucleus (1); a green dye is obtained by reacting a mixture of copper phthalocyanine tetrasulphonic acid dichloride and trichloride with 1-(b -aminoethyl)-3-methylpyrazolone-(5) and the product is coupled with the diazonium salt from 2-sodium sulphonate - 6 - aminobenzothiazole (2); the amine of the formula is diazotized and coupled with 1-(2-chloro-5-sulphophenyl) - 3 - methyl - pyrazolone - 5 (3); the compounds of the formula are reduced and the amines obtained diazotized and coupled with 1-hydroxy-naphthalene-