Process for the preparation of vitamin A and new intermediates
US5637779A · kind A · utility
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12References
14Claims
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Key dates
| Filing date | Feb 3, 1995 |
| Grant date | Jun 10, 1997 |
| Priority date | — |
| Expiry date | Feb 3, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C2601/16
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for the preparation of vitamin A which comprises condensing ethynyl-.beta.-ionol with the acetal of a C.sub.5 allylic halide in the presence of a catalytic amount of a copper-based catalyst and a base; hydrogenating the condensed compound; eliminating the hydroxyl functional group to obtain retinal; and correcting the retinal obtained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.