Preparation of anhydrides by carbonylation of esters
US4353844A · kind A · utility
4Cited by
6References
30Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 7, 1981 |
| Grant date | Oct 12, 1982 |
| Priority date | — |
| Expiry date | Jul 7, 2001 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C51/56
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.