Process for the preparation of carboxylic acid anhydrides

Details Process for the preparation of carboxylic acid anhydrides Process for the preparation of carboxylic acid anhydrides

C - Chemistry, Metallurgy

07

C

260/362.5, 260/4

C07C 53/00 (2006.01) C07C 51/56 (2006.01) C07C 63/06 (2006.01) C07C 65/21 (2006.01) C07C 205/57 (2006.01) C07D 307/68 (2006.01)

Patent

CA 1195692

ABSTRACT Carboxylic acid anhydrides of the general formula R-CO-O-CO-R' (I) in which R and R' are identical or different and represent an optionally substituted alkyl group having 1 to 18 carbon atoms, an optionally substituted cyclo- alkyl group having 3 to 12 carbon atoms or an optionally substituted aryl group, or represent an optionally substituted 5-membered or 6-membered heterocyclic radical which additionally can be fused to a benzene ring, are obtained in high yields by a process in which a tri- methylsilyl carboxylate of the general formula R-CO-OSi(CH3)3 (II) in which R has the meaning given above, is reacted with a carboxylic acid-halide of the general formula R'CO-X (III) in which R' has the meaning given above, and X represents a halogen atom, if appropriate in the presence of a catalyst and, if appropriate, in the presence of a diluent, at a temperature between 20 and 250°C. Carboxylic acid anhydrides are valuable intermediate products for organic syntheses. They can be used, for example, for the preparation of certain herbicidally active compounds.

415310

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