| 摘要 |
1,132,638. Azo dyestuffs. FARBENFABRIKEN BAYER A.G. 16 Sept., 1966 [17 Sept., 1965], No. 41446/66. Heading C4P. The invention comprises dyestuffs, free from carboxylic and sulphonic acid groups, of the formula:- R-N=N-R 1 -OH wherein R represents the radical of an aromaticheterocyclic six-membered ring containing at least one N atom, and which is linked to the azo group through a carbon atom of the nitrogen-containing portion of the aromatic-heterocyclic ring, and R 1 represents a radical of the benzene series in which the OH group and azo group are in o-positions to each other, or a radical of the naphthalene series in which the OH group is in theα-position and the azo group is in the #-position; and the dyestuffs in their tautomeric form:- R-NH-N = R 1 = O wherein the azo-function is in the o-position to the double bonded N atom. They may be obtained by reacting by 1 mol of a hydrazine compound of the formula:- R-NH-NH 2 with approximately 1 mol of a quinone of the benzene or naphthalene series or with a precursor thereof in the presence of a dehydrogenating or oxidizing agent. Specified precursors are phenols, 1- or 2-naphthols and 1-amino-2- naphthol. The dyes may be treated with metalyielding agents in substance, or on or in a substrate. Specified R groups contain one, two or three N atoms and may further contain fused aromatic-carbocyclic or -heterocyclic rings. Examples are given for the production of the dyes. They are useful for dyeing or printing synthetic fibres, especially metal-modified polypropylene fibres.
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