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:
Sep. 17, 1985
Filed:
Oct. 06, 1983
Applicant:
Inventors:
Laurence W Reilly, Jr, Yorktown Heights, NY (US);
Jeffrey N Barton, New York, NY (US);
Assignee:
USV Pharmaceutical Corp., Tarrytown, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
560 38 ; 562571 ; 562443 ; 560191 ;
Abstract
The (S,S) optical isomer of a compound having the general formula ##STR1## wherein R and R.sub.1-5 are as defined herein, is recovered essentially free of the (R,S) and (S,R) isomers, by forming a solution of the esters of the (S,S) and the (R,S) and/or (S,R) isomers of said compound, selectively precipitating an acid salt (e.g. maleate) of the (S,S) ester from the solution, and treating the precipitate to form the desired free acid.