Process for preparing 5-ethylidene-2-norbornene with high quality
US4727204A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 18, 1986 |
| Grant date | Feb 23, 1988 |
| Priority date | — |
| Expiry date | Dec 18, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C5/2556
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
5-Ethylidene-2-norbornene with high quality is effectively prepared by isomerization 5-vinyl-2-norbornene containing 1 ppm to 0.5% by weight of 4-vinylcyclohexene in the presence of at least one catalyst selected from the group consisting of a solid base catalyst which is prepared by reacting alumina, an alkali metal hydroxide and an alkali metal in a temperature range of 200.degree. to 500.degree. C. and a solid base catalyst which is prepared by reacting water-containing alumina and an alkali metal in such an amount that exceeds a molar equivalent of water contained in alumina at a temperature in a range between a melting point of the alkali metal and 500.degree. C. in an inert gas atmosphere.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.