Patent · US Expired

Process for making carboxylic acid halides

US4414160A · kind A · utility

7Cited by

8References

5Claims

0Family size

Assignee

Hoechst GmbH · DE

Inventors

Heinz Erpenbach · Cologne, DE
Klaus Gehrmann · Lechenich, DE
Winfried Lork · Lechenich, DE
Peter Prinz · Ethel, US

Key dates

Filing date	Sep 14, 1981
Grant date	Nov 8, 1983
Priority date	—
Expiry date	Sep 14, 2001

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C51/58
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

The invention relates to the manufacture of carboxylic acid halides. To this end, an alkyl halide having from 1 to 6 carbon atoms or an aryl halide is reacted with carbon monoxide under practically anhydrous conditions at temperatures of 350 to 575 K. and under pressures of 1 to 300 bars in the presence of a catalyst system containing at least one of the noble metals selected from rhodium, palladium, iridium or their compounds, iodine and/or its compounds, methyl trialkyl phosphonium iodide and/or methyl triaryl phosphonium iodide, and optionally trialkyl phosphine oxide or triaryl phosphine oxide as well as an inert organic solvent. More specifically, the reaction mixture is admixed with 0.02 to 0.75 mol of hydrogen per mol of carbon monoxide.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.