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. 04, 1998
Filed:
Oct. 22, 1997
Applicant:
Inventors:
Assignee:
Takasago International Corporation, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
C07F / ; C07F / ; C07C / ;
U.S. Cl.
CPC ...
556 18 ; 556 21 ; 556136 ; 560160 ; 560174 ; 560243 ; 560247 ; 560 19 ; 560 51 ; 568 13 ; 568 17 ;
Abstract
Disclosed are an optically active diphosphine represented by formula: ##STR1## wherein R represents a lower alkyl group having 1 to 4 carbon atoms; Ar represents a phenyl group which may be substituted with a lower alkyl group having 1 to 4 carbon atoms and/or a lower alkoxy group having 1 to 4 carbon atoms, a transition metal complex containing the diphosphine as a ligand, and a process for producing an optically active .delta.-oxo-.alpha.-cyano ester using the transition metal complex as a catalyst.