Chemical process for preparing alkyl esters or the amide of 3-(.beta.,.beta .
US4228299A · kind A · utility
8Cited by
2References
2Claims
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Key dates
| Filing date | Nov 17, 1977 |
| Grant date | Oct 14, 1980 |
| Priority date | — |
| Expiry date | Nov 17, 1997 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C255/19
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Process for the preparation of 1-lower alkoxycarbonyl-3-(.beta.,.beta.-dichlorovinyl)-2,2-dimethylcyclopropanes from the corresponding 1-cyano-1-carboxylic acid ester by hydrolysis, decarboxylation of the free carboxylic acid, reaction of the cyclopropane nitrile with a lower aliphatic alcohol and anhydrous hydrogen chloride, followed by alcoholysis or hydrolysis of the reaction product so obtained to give the desired ester or carboxylic acid. Includes a method for the separation of essentially pure cis- and trans-isomers from the mixed nitriles. The products are useful intermediates for the preparation of pyrethroid insecticides.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.