Process for coupling of water-insoluble 2,4-disubstituted phenol

Details Process for coupling of water-insoluble 2,4-disubstituted phenol Process for coupling of water-insoluble 2,4-disubstituted phenol

1975-05-06

1976-12-21

Warren, Charles F.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260207, C09B 2912

Patent

active

039988040

ABSTRACT:
Substituted 2-nitro-2'-hydroxy-azobenzenes are manufactured by coupling a phenol dispersed with a dispersing agent in water with a solution, in an inorganic acid, of a diazotized o-nitroaniline at a pH value not exceeding 2.
The azobenzenes obtained are intermediate products for benztriazoles.

REFERENCES:
Fierz-David et al., Fundamental Processes of Dye Chemistry, Interscience Publishers, Inc.; New York, 1949, pp. 239-241 and 252-254.
Zollinger, Helv. Chim. Acta., 36, 1070 (1953).
Allan, Coll. Czech. Chem. Com., 16-17, 620 (1952).

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