Process for the preparation of monocarboxylic anhydrides

Details Process for the preparation of monocarboxylic anhydrides Process for the preparation of monocarboxylic anhydrides

1989-05-03

1990-08-28

Killos, Paul J.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid anhydrides

C07C 5154

Patent

active

049527274

ABSTRACT:
In the process for the preparation of monocarboxylic anhydrides of the general formula (RCO).sub.2 O by reacting a carboxylic acid ester of dialkyl ether of the general formula RCOOR or ROR, where R in each case denotes the same alkyl radical having 1 to 4 carbon atoms, with carbon monoxide in the gas phase in the presence of iodine or bromine or compounds thereof as reaction promoter, and in the presence of a supported catalyst, at temperatures of from 130.degree. to 400.degree. C. and pressures of from 1 to 150 bar, where, in the supported catalyst, an organosilicon compound is bonded, as a polyfunctional coupling agent, on the one hand to a support material and on the other hand to a noble-metal compound from group VIII of the Periodic Table, a chelate-forming organosilicon compound of the general formula ##STR1## is employed as the polyfunctional coupling agent, where X=Cl, Br or --OR.sup.2 ;

REFERENCES:
patent: 4657884 (1987-04-01), Luft et al.
patent: 4776987 (1988-10-01), Luft et al.

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