Abstract: Reactive dyes which are particularly suitable for dyeing or printing cellulose-containing fiber materials by the exhaust method or by continuous methods having the formula ##STR1## in which D and D' are each independently of the other a radical of a monoazo, polyazo, metal complex azo, anthraquinone, phthalocyanine, formazan, azomethine, dioxazine, phenazine, stilbene, triphenylmethane, xanthene, thioxanthone, nitroaryl, naphthoquinone, pyrenequinone or perylenetetracarbimide dye, R', R", B.sub.1 and B.sub.2 are independently of each other hydrogen or alkyl which has 1 to 4 carbon atoms and which is unsubstituted or substituted by halogen, hydroxyl, cyano, C.sub.1 -C.sub.4 -alkoxy, C.sub.1 -C.sub.4 -alkoxycarbonyl, carboxyl, sulfamoyl, sulfo or sulfato, X and Y are independently of each other fluorine, chlorine, bromine, sulfo, C.sub.1 -C.sub.4 -alkylsulfonyl or phenylsulfonyl, B is a direct bond or a radical --CH.sub.2).sub.n or --O--CH.sub.2).sub.n, n is 1 to 6; R is a radical of the formula ##STR2## Z is .