Preparation of acyl chlorides

US5166427A · kind A · utility

Assignee

• BASF SE

Inventors

• Andreas Hohmann · Ludwigshafen, DE
• Enrique Freudenberg · Schifferstadt, DE
• Wolfgang Reuther · Neckargemünd, DE
• Kurt Mayer · Essen, DE

Key dates

• Filing date: Jun 24, 1991
• Grant date: Nov 24, 1992
• Expiry date: Jun 24, 2011

Classification

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

Abstract

Acyl chlorides of the general formula ##STR1## where R is C.sub.8 -C.sub.30 -alkyl, C.sub.8 -C.sub.30 -alkenyl or C.sub.8 -C.sub.30 -alkynyl, are prepared from a carboxylic acid of the general formula II ##STR2## where R has the abovementioned meanings, and phosgene, COCl.sub.2 (III), in the presence of a catalyst adduct of phosgene and N,N-dialkylformamide of the general formula IV ##STR3## where R.sup.1 and R.sup.2 independently of one another are each C.sub.1 -C.sub.3 -alkyl, preferably a 1:1 adduct in excess N,N-dialkylformamide, the reaction product I being obtained by phase separation, by a process in which II and III are used in essentially equimolar amounts and the phase containing the catalyst adduct is reused.