Process for the manufacture of 2-(2-hydroxyphenyl)benztriazoles

Details Process for the manufacture of 2-(2-hydroxyphenyl)benztriazoles Process for the manufacture of 2-(2-hydroxyphenyl)benztriazoles

1974-11-25

1977-01-04

Coughlan, Jr., Paul M.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07D24920

Patent

active

040012662

ABSTRACT:
Process for the manufacture of 2-(2-hydroxyphenyl)benztriazoles of the formula I ##STR1## wherein R.sub.1 denotes hydrogen or halogen, R.sub.2 denotes hydrogen, alkyl, alkoxy, alkylsulphonyl, acylamino, --SO.sub.3 H, --COOH or halogen, R.sub.3 denotes hydrogen, alkyl, cycloalkyl, aralkyl, aryl or halogen, R.sub.4 denotes hydrogen, alkyl, alkoxy or --OH and R.sub.5 denotes hydrogen, alkyl, cycloalkyl, aralkyl, aryl, carboxyalkyl, alkoxy, acylamino or halogen, characterized in that a 2-(2-hydroxyphenyl)-benztriazole-1 oxide in the formula III ##STR2## is reacted with 0.5 to 0.6 mol equivalent of hydrazine hydrate at a temperature above 100.degree. C, in a high-boiling ether as the solvent and in the presence of a base.

REFERENCES:
patent: 3230194 (1966-01-01), Boyle
patent: 3773751 (1973-11-01), Brooks
Ochiai, "Aromatic Amine Oxides" pub. by Elsevier Pub. Co., Amsterdam, (1967), p. 205.

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