Process for the preparation of azo dyes

Details Process for the preparation of azo dyes Process for the preparation of azo dyes

1979-05-25

1981-01-06

Doll, John

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260152, 260338, 260339, 260465E, 548372, 548375, 548376, 548377, 562439, C07C 2704, C07C12000, C07C12182

Patent

active

042435838

ABSTRACT:
The invention relates to a process for the preparation of azo dyes of the formula ##STR1## or mixtures thereof, in which Ar is a substituted or unsubstituted phenyl, naphthyl or aromatic heterocyclic radical and Y is a group of the formula --O-R, --S-R or ##STR2## in which R is a substituted or unsubstituted alkyl, aryl or heterocyclic radical and R.sub.1 and R.sub.2 independently of one another are hydrogen or a substituted or unsubstituted alkyl, aryl or heterocyclic radical, and the groups R.sub.1 and R.sub.2, together with the nitrogen atom to which they are bonded, can form a ring.
The process comprises first coupling dimeric malonodinitrile with a diazo component and cyclizing the resulting intermediate with an alcohol, thioalcohol or amine.

REFERENCES:
patent: 3778446 (1973-12-01), Weigert
patent: 3883532 (1975-05-01), Begland
patent: 3912744 (1975-10-01), Heinrich et al.
patent: 3912745 (1975-10-01), Heinrich et al.
patent: 4017533 (1977-04-01), Ohtsuka
patent: 4032559 (1977-06-01), McCall et al.

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