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:
Feb. 16, 1999
Filed:
Dec. 22, 1997
Applicant:
Inventors:
Takao Saito, Hiratsuka, JP;
Tohru Yokozawa, Hiratsuka, JP;
Xiaoyaong Zhang, Hiratsuka, JP;
Noburo Sayo, Hiratsuka, JP;
Assignee:
Takasago International Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07F / ; C07F / ; C07D / ;
U.S. Cl.
CPC ...
556 21 ; 502166 ; 556 13 ; 556 23 ; 556136 ; 556138 ; 568 12 ; 568 14 ; 568 17 ; 549212 ; 549220 ; 549221 ;
Abstract
A novel diphosphine compound of the formula (I): ##STR1## where R.sup.1 and R.sup.2 represent independently cycloalkyl, unsubstituted or substituted phenyl, or a five-membered heteroaromatic ring. The compound is useful as a ligand for an asymmetric reaction, in particular, as an asymmetric hydrogenation catalyst.