Preparation of anhydrides by carbonylation of esters

Details Preparation of anhydrides by carbonylation of esters Preparation of anhydrides by carbonylation of esters

1981-07-07

1982-10-12

Brown, Johnnie R.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260546, C07C 5156, C07C 5312

Patent

active

043538444

ABSTRACT:
Carboxylic acid anhydrides are prepared by carbonylating a carboxylic acid ester in liquid phase, in an essentially anhydrous reaction medium including a sulfone reaction solvent, and in the presence of a catalytically effective amount of (i) nickel and an alkyl or acyl iodide promoter therefor, and (ii) a co-catalyst which comprises at least one alkali or alkaline earth metal salt, or quaternary ammonium or phosphonium iodide.
The subject process is well adapted, e.g., for the preparation of acetic anhydride by carbonylation of methyl acetate.

REFERENCES:
patent: 4002678 (1977-01-01), Naglieri et al.
patent: 4115444 (1978-09-01), Rizkalla
patent: 4239698 (1980-12-01), Isshiki et al.
patent: 4241219 (1980-12-01), Wan
patent: 4246195 (1981-01-01), Szecsi
patent: 4251458 (1981-02-01), Pugach

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