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. 23, 2003
Filed:
Jun. 09, 2000
Applicant:
Inventors:
Toshio Tatsuoka, Nishinomiya, JP;
Katsuhide Kamei, Takatsuki, JP;
Assignee:
Daiichi Suntory Pharma Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
C07D / ;
Abstract
A method of production of 2,4′-dipyridyl derivatives by a cross coupling reaction of a 2-halopyridine derivative and a 4-halopyridine using a nickel complex catalyst and a method of separation of a 2,4′-dipyridyl derivative from a mixture of dipyridyl isomers containing a 2,2′-dipyridyl derivative, 2,4′-dipyridyl derivative, and 4,4′-dipyridyl by using a dilute aqueous copper sulfate solution to insolubilize and remove the 2,2′-dipyridyl derivative and 4,4′-dipyridyl are disclosed.