Preparation of cyanobenzyl cyclopropane carboxylates

Details Preparation of cyanobenzyl cyclopropane carboxylates Preparation of cyanobenzyl cyclopropane carboxylates

1982-05-07

1983-10-11

Torrence, Dolph H.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C12175

Patent

active

044091508

ABSTRACT:
A method for preparing a pyrethroid insecticide of general formula: ##STR1## wherein the two hydrogen atoms on the cyclopropane ring are in the cis- configuration, in which an acid of formula: ##STR2## is neutralized with a water-soluble base and then reacted in the presence of a phase-transfer catalyst with a solution in a substantially water-immiscible organic solvent of an alpha-cyanobenzyl aryl sulphonate of formula: ##STR3## the substituents in the formulae having the following meanings; A represents an optionally substituted aryl group; R.sub.1 and R.sub.2 represent hydrogen or halogen; and R.sub.3 and R.sub.4 represent chlorine, bromine, or methyl.

REFERENCES:
Itaya et al., "Synthetic Pyrethroids", ACA Symposium Series 42, pp. 45-54.
Elliott et al., Nature, vol. 28, pp. 710-711 (1974).

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