Fiber-reactive monoazo and disazo dyes

摘要

Preparation of water-soluble reactive dyes containing vinylsulphonyl and beta -sulphatoethylsulphonyl groups by the oxidation of dyes containing beta -hydroxyethylmercapto radicals, and then sulphation and, if appropriate, conversion of the beta -sulphatoethylsulphonyl radical to the vinylsulphonyl radical with bases. Novel fiber-reactive monoazo or disazo dyes of the structure <IMAGE> (Ia) wherein the substituents have the formulae given in the description and a method of coloring polyurethane plastics using dyestuffs of the formula the formula <IMAGE>