Asymmetric 1:2 metal complexes of diazo compounds

Abstract

1:2 Metal complexes of the formula ##STR1## in which each of X.sub.1 and X.sub.2, independently, is --COO-- or --O--, each of B.sub.1 and B.sub.2, independently, is a radical of a coupling component of the benzene or oxyquinoline series, M is a metal capable of forming a 1:2 complex and, each of ##STR2## independently, is the radical of a diazo component of the benzene series, with the proviso that at most one of such diazo component radicals contains a single sulpho group, and mixtures thereof with one or more of the corresponding symmetrical 1:2 metal complexes, which complexes and mixtures of complexes are in free acid or salt form and are useful as anionic dyes for dyeing and printing substrates such as natural and regenerated cellulose, natural and synthetic polyamides, polyurethanes and polymers modified to contain basic groups, especially leather.

Dependencies are inferred from the claim text.