Process for the preparation of aminoazo 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.