Process for the preparation of bis-triazolylstilbenes

US4217449A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Alfons Dorlars · Leverkusen, DE
• Otto Neuner

Key dates

• Filing date: Oct 11, 1978
• Grant date: Aug 12, 1980
• Expiry date: Oct 11, 1998

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D249/06
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Process for the preparation of bis-triazolylstilbene compounds which, in the form of the free acid, correspond to the formula ##STR1## wherein the phenyl radicals A can be substituted by halogen, C.sub.1 -C.sub.4 -alkyl or C.sub.1 -C.sub.4 -alkoxy, from bis-hydroxyiminohydrazonostilbene compounds of the formula ##STR2## characterized in that the bis-hyroxyiminohydrazonostilbene compounds are reacted with anhydrides of lower carboxylic acids in the presence of urea and polar solvents at temperatures from 10.degree. to 60.degree. C.