Process for preparing carboxylic acid anhydrides
US4251458A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 2, 1979 |
| Grant date | Feb 17, 1981 |
| Priority date | — |
| Expiry date | Oct 2, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C51/54
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A carboxylic acid anhydride, such as acetic anhydride, is prepared from a carboxylate ester or a hydrocarbyl ether in carbonylation processes comprising the use of a halide, carbon monoxide and a Group VIII noble metal in the presence of promoters comprising at least one metal of Group VIB of the Periodic Table, or their compounds, and an arsine of the formula ##STR1## wherein R and R.sup.1 are monocyclic aryl groups or alkyl groups and R.sup.2 is the radical ##STR2## a monocyclic aryl group or an alkyl group, and wherein R.sup.3 and R.sup.4 are each a monocyclic aryl group or an alkyl group, with the proviso that at least one of R, R.sup.1 and R.sup.2 is a monocyclic aryl group, n being zero or a digit from 1-20.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.