Intermediates for the preparation of vitamin A and carotenoids and process for their preparation
US5639919A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 7, 1995 |
| Grant date | Jun 17, 1997 |
| Priority date | — |
| Expiry date | Jun 7, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C2601/16
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The present invention relates to novel intermediates for the preparation of vitamin A and carotenoids, corresponding to the following formula (I): ##STR1## in which X is a carbon atom; n is equal to 1 or 2; R.sub.1, R.sub.2 and R.sub.3, which may be identical or different, each independently represent hydrogen, alkyl containing 1 to 4 carbon atoms, alkenyl containing 2 to 11 carbon atoms or aryl, each alkyl and alkenyl may be linear, branched or cyclic, or R.sub.1 and R.sub.2 can together with the carbon atom to which they are attached form a cycloaliphatic compound which is optionally substituted; and R.sub.4, R.sub.5, R.sub.6, R.sub.7 and R.sub.8, which may be identical or different, each independently represent hydrogen, alkyl containing 1 to 4 carbon atoms or alkenyl containing 2 to 10 carbon atoms, each alkyl or alkenyl being linear, or if containing sufficient numbers of carbon atoms, may also be branched or cyclic, or an aryl containing 6 to 10 carbon atoms, or any two of R.sub.4, R.sub.5, R.sub.6, R.sub.7 and R.sub.8 may together form, along with the carbon atom(s) to which they are attached, a cycloalkylidene group containing 3 to 10 carbon atoms, as well as the process fo…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.