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:
Jun. 21, 1988
Filed:
Jun. 19, 1986
Applicant:
Inventors:
Ayumu Inoue, Aomori, JP;
Takeaki Umemura, Hyogo, JP;
Assignee:
Sumitomo Chemical Company, Limited, Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07B / ;
U.S. Cl.
CPC ...
26050116 ; 560105 ; 562401 ; 562402 ; 562496 ;
Abstract
Alpha-isopropyl-p-chlorophenylacetic acid, which is an acid moiety of the pyrethroidal ester pesticides is subjected to optical resolution using optically active alpha-phenyl-beta-p-tolylethylamine or optically active alpha-phenylethylamine, as the optical resolution agent. The reaction of the acid with the amine is carried out in a hydrophobic organic solvent, such as aliphatic and aromatic hydrocarbons, in the presence of water, until the desired salt of the acid with the amine is separated therein through selective crystallization.