Preparation of cyanobenzyl cyclopropane carboxylates

Details Preparation of cyanobenzyl cyclopropane carboxylates Preparation of cyanobenzyl cyclopropane carboxylates

B - Operations, Transporting

01

J

260/479.8

B01J 31/02 (2006.01) A01N 53/00 (2006.01)

Patent

CA 1162561

K 1839 ABSTRACT A method for preparing a pyrethroid insecticide of general formula: (I) Image wherein the two hydrogen atoms on the cyclopropane ring are in the cis - configuration, in which an acid of formula: Image (II) is neutralised 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: (III) Image the substituents in the formulae having the following meanings; A represents an optionally substituted aryl group; R1 and R2 represent hydrogen or halogen; and R3 and R4 represent chlorine, bromine, or methyl.

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