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:
Jul. 09, 1985
Filed:
Jun. 14, 1983
Applicant:
Inventors:
William J Coates, Welwyn Garden City, GB;
Brian H Warrington, Welwyn Garden City, GB;
Assignee:
Smith Kline & French Laboratories Limited, Welwyn Garden City, GB;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07D / ; C07C / ;
U.S. Cl.
CPC ...
544239 ; 562463 ;
Abstract
A process for preparing 6-(2-hydroxyphenyl)-3-pyridazinone which comprises reacting 2-hydroxyacetophenone with glyoxylic acid under alkaline conditions, adjusting the pH of the reaction mixture to give a mixture within a pH range of about pH 4.0-9.5 and which contains a weak base, and subsequently reacting with hydrazine. 6-(2-Hydroxyphenyl)-3-pyridazinone is a useful intermediate in the preparation of anti-hypertensive agents.