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. 13, 1983
Filed:
Nov. 16, 1981
Applicant:
Inventors:
Ramon J Alabaster, Puckeridge, GB;
Stanley H Wright, Sawbridgeworth, GB;
Assignee:
Merck & Co., Inc., Rahway, NJ (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
560 40 ; 562401 ; 562446 ;
Abstract
Resolution of the .alpha. and .beta. isomers of .alpha.-pivaloyloxyethyl-(S)-3-(3,6-dihydroxyphenyl)-2-methylalaninate is accomplished by; (a) forming the (+) hydrogen tartrate salt of the mixture; (b) fractionally crystallizing the .beta.-isomer salt; and (c) recovering the .alpha.-isomer from the mother liquor by treatment with first a base and second a mineral acid.