2-(trimethyl-tridecenyl)-tetramethylchroman intermediates for vitamin E
US4789750A · kind A · utility
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16Claims
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Key dates
| Filing date | Mar 27, 1987 |
| Grant date | Dec 6, 1988 |
| Priority date | — |
| Expiry date | Mar 27, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D311/58
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
6-Etherified hydroxy -2-(4',8',12'-trimethyl-5'-tridecenyl)-2,5,7,8-tetramethylchromans with an oxo or hydroxy substituent at the 2' position which may be substituted with an arylsulfonyl or a carboxyalkyl at the 3' position and containing a single or double bond at the 11 position, said chromans being intermediates for producing natural vitamin E.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.