Esters of .beta.,.gamma.-unsaturated carboxylic acids by carbonylation of conjugated dienes
US4433164A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 20, 1982 |
| Grant date | Feb 21, 1984 |
| Priority date | — |
| Expiry date | Jan 20, 2002 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C69/533
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Esters of .beta.,.gamma.-unsaturated carboxylic acids, e.g., penten-3-oates, are prepared by carbonylating a necessarily conjugated diene, e.g., butadiene, with carbon monoxide, in the presence of (i) an alcohol corresponding to the desired ester, (ii) a halogen hydracid, (iii) a palladium catalyst which comprises palladium metal, a palladium oxide, or a salt of palladium, or ionic complex thereof, the anion coordinated with the palladium cation of which being a hard or intermediate base, and (iv) a quaternary onium salt of elemental nitrogen, phosphorus or arsenic, said elemental nitrogen, phosphorus or arsenic being tetracoordinated with carbon atoms and the anion of said salt comprising a hard or intermediate base.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.