Process for the preparation of carboxylic anhydrides

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

1983-12-12

1985-08-20

Trousof, Natalie

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260546, C07C 5112

Patent

active

045363544

ABSTRACT:
A process is disclosed for preparing carboxylic acid anhydrides by reacting certain esters or ethers with carbon monoxide in the presence of a nickel catalyst, a source of iodide and/or bromide and conventional promoters, which process is improved by the use as co-promoters of a compound selected from compounds of the formula ##STR1## in which X represents phosphorus, arsenic or antimony and Y represents oxygen, sulphur or selenium, and a and b are O or 1 and R.sup.5 represents hydrogen or an optionally substituted hydrocarbon group and R.sup.6 and R.sup.7 represent an optionally substituted hydrocarbon group; compounds wherein a and b are O and R.sup.6 and R.sup.7 form a heterocyclic group with X and R.sup.5 represents hydrogen or an optionally substituted hydrocarbon group; and complexes of compounds of formula I with any of a hydrocarbon iodide or bromide, an acyl iodide or bromide, or hydrogen iodide or hydrogen bromide.

REFERENCES:
patent: 3725305 (1973-04-01), Wilkinson
patent: 4190729 (1980-02-01), Forster
patent: 4239698 (1980-12-01), Isshiki et al.
patent: 4273936 (1981-06-01), Fiato et al.
patent: 4335059 (1982-06-01), Rizkalla
Kosolapoff, Gennady M. Organophosphorus Compounds (1958) p. 23, John Wiley & Sons, publ.

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