Novel process for preparation of benzotriazoles using aryldiols

Details Novel process for preparation of benzotriazoles using aryldiols Novel process for preparation of benzotriazoles using aryldiols

1985-12-18

1987-02-10

Hendricks, Glenna M.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

548257, C07D24920

Patent

active

046423508

ABSTRACT:
Process for preparing 2-(2'-hydroxyphenyl)-benzotriazoles of the formula ##STR1## from 2-nitro-2'-hydroxyazobenzenes of the formula ##STR2## which comprises reducing a 2-nitro-2'-hydroxyazobenzene compound in a strongly basic medium in the presence of an aromatic dihydroxy or dioxo compound as catalyst and of an alcohol having more than one carbon atom. The 2-(2'-hydroxyphenyl)-benzotriazole compounds are known stabilizers for organic materials.

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Hashimoto, et al., ". . . Catalytic Effects of Quinones on Sodium Disulfide Reduction of Azobenzene," Chem. Abst. 66:64836(X) (1967).
Chem. Abst. 98, 126102b (1983).
Chem. Abst. 102, 113511k (1985).
Chem. Abst. 102, 45959k (1985).
Organikum (Practical Organic Chemistry) Berlin 1976, p. 604.

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