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:
Jul. 02, 1991
Filed:
Nov. 17, 1989
Applicant:
Inventor:
Michael S Glenn, Langhorne, PA (US);
Assignee:
FMC Corporation, Philadelphia, PA (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
558407 ;
Abstract
A mixture of isomers of cypermethrin or cyfluthrin enriched in the more insecticidally active c.sub.2 or t.sub.2 isomer, or both, is prepared by adding .alpha.-hydroxy-3-phenoxyphenylacetonitrile or its 4-fluoro analog to a refluxing solution of 3-(2,2-dichloroethenyl)-2-2-dimethylcyclopropanecarbonyl chloride in a hydrocarbon solvent boiling in the range of about 75.degree. to 115.degree. C. in an inert atmosphers, without an acid acceptor being present in the reaction mixture. The product is recovered by washing the reaction mixture with aqueous base.