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:
Aug. 02, 1994
Filed:
Sep. 30, 1993
Applicant:
Inventors:
Assignee:
Takasago International Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07C / ; C07C / ; C07B / ;
U.S. Cl.
CPC ...
562590 ; 562433 ; 562450 ; 562606 ;
Abstract
A process for preparing an optically active carboxylic acid is disclosed, comprising asymmetric hydrogenation of an .alpha.,.beta.-unsaturated carboxylic acid using an alcohol as a hydrogen donor in the presence of a metal-optically active phosphine complex. A carboxylic acid having high optical purity can easily be obtained in a high yield without using specific equipment as required in using hydrogen gas as a hydrogen donor.