Process for the manufacture of carboxylic acid chlorides

US3962326A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Gunther Semler · Kelkheim, DE
• Georg Schaeffer
• Karl Waldmann · Bad Soden am Taunus, DE

Key dates

• Filing date: Apr 24, 1974
• Grant date: Jun 8, 1976
• Expiry date: Apr 24, 1994

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C51/60
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Process for preparing carboxylic acid chlorides by reaction of carboxylic acids or carboxylic anhydrides with phosgene at temperatures of from 0.degree. to 180.degree.C in the presence of a catalyst, wherein 0.01 to 10 weight percent, calculated on the carboxylic acid or the carboxylic anhydride, of trisubstituted phosphine oxides or trisubstituted phosphine sulfides or reaction products of these compounds with phosgene and/or acids or acid anhydrides or mixtures of these compounds are used as catalyst.