Process for preparing menthyl esters of enantiomers of chiral 3-(2,2-dichloro- and -dibromo-vinyl)-2,2-dimethylcyclopropanecarboxylic acids
US4345090A · kind A · utility
3Cited by
1References
5Claims
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Key dates
| Filing date | Jun 26, 1980 |
| Grant date | Aug 17, 1982 |
| Priority date | — |
| Expiry date | Jun 26, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S204/90
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A substantially pure compound selected from the group consisting of the d-menthyl esters of 1RS-cis-, 1RS-cis/trans-, 1R-cis-, 1S-cis-, 1R-trans- and 1S-trans-3-(2,2-dichloro- and dibromo-vinyl)-2,2-dimethylcyclopropanecarboxylic acid, the 1-menthyl esters of 1RS-cis-, 1RS-trans-, 1RS-cis/trans-, 1R-cis-, 1S-cis-, 1R-trans- and 1S-trans-3-(2,2-dibromo-vinyl)-2,2-dimethyl-cyclopropanecarboxylic acid and the 1-menthyl esters of 1R-trans- and 1S-trans-3-(2,2-dichloro-vinyl)-2,2-dimethyl-cyclopropanecarboxylic acid. The esters are produced by reacting enantiomers of the acids with d- or 1-menthol are selectively crystallizing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.