Process for the preparation of cyclopropane derivatives, intermediates in the synthesis of pyrethroid insecticides
US4284582A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 12, 1980 |
| Grant date | Aug 18, 1981 |
| Priority date | — |
| Expiry date | Aug 12, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C255/45
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Compounds of formula: ##STR1## wherein both groups X are chlorine, bromine or trifluoromethyl, or one X is chlorine or bromine and the other is trifluoromethyl, and Y is --CN or --COOR in which R is an alkyl group, are obtained by (A) reacting a compound of the formula: ##STR2## wherein X.sup.1 is chlorine or bromine, with a compound of the formula: EQU X.sub.2 C.dbd.CH--CH.dbd.C(CH.sub.3).sub.2 in the presence of metallic copper or at least one copper salt and a base, or (B) reacting a compound of the formula: EQU Y--CH.sub.2 --CN with a compound of the formula: EQU X.sub.2 C.dbd.CH--CH.dbd.C(CH.sub.3).sub.2 and chlorine or bromine, in the presence of at least one reducible copper salt and a base, or (C) reacting a compound of formula: EQU X--CH.sub.2 --CN with a compound of the formula: ##STR3## wherein X.sup.1 is chlorine or bromine, in the presence of at least one copper salt. The compounds are intermediates in the synthesis of pyrethroid insecticides.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.