High caustic coupling process for preparing substituted 2-nitro-

Details High caustic coupling process for preparing substituted 2-nitro- High caustic coupling process for preparing substituted 2-nitro-

1979-05-16

1981-06-23

Higel, Floyd D.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260141, 260144, 260207, 260 458NT, 548260, 8444, 568718, C07C10706, C09B 2912, C07D24920

Patent

active

042750040

ABSTRACT:
Substituted 2-nitro-2'hydroxyazobenzenes are prepared by adding an aqueous mineral acid solution of a diazotized o-nitroaniline to a strongly alkaline lower alkanol or aqueous lower alkanol solution of a substituted phenol, containing sufficient alkali metal hydroxide to assure a pH value substantially over 11 and an excess of hydroxyl ion in the reaction mixture even after all the acidic diazonium salt solution is added, wherein the reaction solvent mixture is at least 50% by weight of lower alkanol, at a reaction temperature between -15.degree. C. and +30.degree. C.
The o-nitroazobenzenes obtained are intermediate products useful in the manufacture of benzotriazole UV absorbers.

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