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. 26, 1993
Filed:
Oct. 14, 1992
Applicant:
Inventors:
William T Murray, Orangeburg, SC (US);
Robert E Young, West Columbia, SC (US);
Azfar A Choudhury, Orangeburg, SC (US);
Deepak R Patil, Orangeburg, SC (US);
Assignee:
Ethyl Corporation, Richmond, VA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07B / ;
U.S. Cl.
CPC ...
562401 ; 558414 ; 560 56 ; 560 57 ; 560 60 ; 560100 ; 560101 ; 560105 ;
Abstract
A process for obtaining a substantially pure enantiomer of an aryl-substituted aliphatic carboxylic acid is described. In this process, the aryl-substituted aliphatic carboxylic acid is reacted with an inorganic base in the presence of an organic base to substantially enrich the precipitate in one of the enantiomers and an improved yield. Substantially pure, enantiomeric salt is separated, leaving a mother liquor comprising the solvent and aryl-substituted aliphatic carboxylic acid enriched in the other enantiomer.