The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 19, 1985
Filed:
Mar. 23, 1983
Jean Gauthier-Lafaye, Lyons, FR;
Robert Perron, Charly, FR;
Jacques Gallucci, Oullins, FR;
Philippe Leconte, Lyons, FR;
Rhone-Poulenc Chimie de Base, Courbevoie, FR;
Abstract
Carboxylic acid anhydrides of the formula RCO--O--COR', e.g., acetic anhydride, are facilely prepared by reacting, in an essentially anhydrous, liquid phase containing an aprotic organic solvent, (i) a compound of the formula RX, (ii) a carboxylate of the formula (R'COO.sup.-).sub.n A.sup.n+, and (iii) carbon monoxide, said reaction being carried out in the presence of a catalytically effective amount of a salt of cobalt tetracarbonyl halide, at a temperature ranging from about 0.degree. to 200.degree. C. and under a pressure which is less than or equal to about 600 bars.