A reactive dye of the formula ##STR159## in which Y is hydrogen or sulfo, U is --CN, --CONH.sub.2, --SO.sub.3 H, --OH or --OSO.sub.3 H, u is the number 2, 3, 4 or 5 and D is a radical of the formula ##STR160## in which Q is C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy, halogen, carboxyl or sulfo, v is the number 0, 1 or 2 and w is the number 1 or 2 and u' is the number 2, 3, 4 or 5, and Z is .beta.-sulfatoethyl, .beta.-thiosulfatoethyl, .beta.-phosphatoethyl, .beta.-acyloxyethyl, .beta.-halogenoethyl or vinyl;
- or D is a radical of the formula ##STR161## Q' is C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy, halogen, carboxyl, sulfo or --SO.sub.2 --Z in which Z is as defined above, v is the number 0, 1 or 2, B is a direct bond or a radical --(CH.sub.2)--.sub.n or --O--(CH.sub.2)--.sub.n ;
- n is 1, 2, 3, 4, 5 or 6;
- R is a radical of the formula ##STR162## in which R' is hydrogen or C.sub.1 -C.sub.6 alkyl, alk is an alkylene radical having 1 to 7 carbon atoms or branched isomers thereof, T is hydrogen, halogen, hydroxyl, sulfato, carboxyl, cyano, C.sub.1 -C.sub.4 alkanoyloxy, C.sub.1 -C.sub.4 alkoxycarbonyl, carbamoyl or a radical --SO.sub.2 --Z, V is hydrogen or C.sub.1 -C.sub.4 alkyl or a radical of the formula ##STR163## in which (alk) is as defined above, alk', independently of one another, are polymethylene radicals having 2 to 6 C atoms or branched isomers thereof, Z is as defined above, p, q, r and t, independently of one another, are each the number 1, 2, 3, 4, 5 or 6 and s is 2, 3, 4, 5 or 6.