The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 11, 1983
Filed:
May. 07, 1982
Applicant:
Inventor:
Derek A Wood, Sittingbourne, GB;
Assignee:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
2604 / ;
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.