Process for the preparation of azo compounds

Details Process for the preparation of azo compounds Process for the preparation of azo compounds

1988-01-12

1989-06-06

Higel, Floyd D.

Organic compounds -- part of the class 532-570 series

Organic compounds

Azo

534587, 534615, 534753, 534768, 534770, 534787, 534788, 534791, 534794, 534795, 534850, 534852, 534887, C09B 2700

Patent

active

048373087

ABSTRACT:
A universally usable process for preparing azo dyestuffs by oxidative coupling consists in carrying out the oxidation in the presence of redox mediators with a standard potential of 0.2-1.5 volts and, if appropriate, an additional oxidizing agent with a standard potential of 0.25-2.5 volts, wherein the sum of the oxidation equivalents should be at least 4. The preferred redox mediator is iodine. The process is particularly suitable for the preparation of heteroaromatic azo dyestuffs using an aniline coupling component.

REFERENCES:
patent: 3153031 (1964-10-01), Alicot et al.
Hunig et al, Ann. Der. Chem., vol. 754, pp. 46 to 55 (1971).

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