Asymmetric 1:2 chromium complexes of monoazo compounds

Abstract

1:2 Chromium complexes of the formula, ##STR1## in which R.sub.1 is hydrogen, chlorine, bromine, nitro (being meta to the first nitro group), C.sub.1-4 alkyl or C.sub.1-4 alkoxy, R.sub.2 is hydrogen or nitro, Y is ##STR2## wherein R.sub.3 is hydrogen, chlorine, bromine, trifluoromethyl, C.sub.1-4 alkyl or C.sub.1-4 alkoxy, and R.sub.4 is hydrogen, chlorine, bromine, C.sub.1-4 alkyl or C.sub.1-4 alkoxy, and A is a ##STR3## wherein the carbon atom marked with the * is bound to the azo radical, which complexes are in free acid or salt form, and mixtures thereof, are useful for dyeing and printing nitrogen-containing organic substrates, for example, natural and synthetic polyamides such as wool, silk and nylon, polyurethanes, polyolefins modified to contain basic groups and leather, for dyeing metals such as anodized aluminum and in printing lacquers and ball-point pen inks.

Dependencies are inferred from the claim text.