Azo dyes, their preparation and use

摘要

Azo dyes of the formula <IMAGE> (1) in which D is the sulfo group-containing radical of an aromatic or heterocyclic diazo component, which can be further substituted and itself can contain an azo bridge, R1 and R2 independently of one another are each a hydrogen atom or a substituted or unsubstituted alkyl or aryl radical and X is a substituted or unsubstituted alkyl or alkenyl radical, and their heavy metal complexes, it being possible for the azo dyes of the formula (1) and their heavy metal complexes to contain reactive radicals.