Preparation of carboxylic chlorides

US5200560A · kind A · utility

Assignee

• BASF SE

Inventors

• Thomas-Michael Kahl · Münstermaifeld, DE
• Jochem Henkelmann · Mannheim, DE
• Leopold Hupfer · Friedelsheim, DE
• Wolfgang Franzischka · Bischofswerda, DE
• Wolfgang Schwarz · Ludwigshafen, DE

Key dates

• Filing date: Jun 30, 1992
• Grant date: Apr 6, 1993
• Expiry date: Jun 30, 2012

Classification

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

Abstract

A process for the preparation of a carboxylic chloride of the general formula I ##STR1## in which R denotes C.sub.1 -C.sub.30 -alkyl, C.sub.2 -C.sub.30 -alkenyl or C.sub.2 -C.sub.30 -alkynyl, from a carboxylic acid of the general formula II ##STR2## in which R has the meanings stated, and phosgene COCl.sub.2 (III), in the presence of a catalyst adduct comprising phosgene and N,N-disubstituted formamide of the general formula IV ##STR3## in which R.sup.1 and R.sup.2 are independently C.sub.1 -C.sub.3 -alkyl or R.sup.1 and R.sup.2 together form a C.sub.4 - or C.sub.5 -alkylene chain which may or may not be interrupted by an oxygen atom or by a nitrogen atom carrying a C.sub.1 -C.sub.3 -alkyl group or CHO, the product being isolated by phase separation, wherein the amount of phosgene added to the formamide (IV) is from 20 to 70% molar, based on the formamide.