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:
Mar. 11, 2003
Filed:
Oct. 25, 1999
Applicant:
Inventor:
Philip John Hogan, Cheshire, GB;
Assignee:
Zeneca Limited, London, GB;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07B 4/504 ; C07D 4/012 ;
U.S. Cl.
CPC ...
C07B 4/504 ; C07D 4/012 ;
Abstract
A process is described for the manufacture of a pyridinesulfonyl chloride or a benzenesulfonyl chloride in which the benzene ring bears one or more electron-withdrawing groups, the process comprising reacting a diazonium salt of an aminopyridine or aminobenzene in which the benzene ring bears one or more electron withdrawing groups with a mixture of thionyl chloride in water, in the presence of an electron transfer catalyst.