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. 27, 2001
Filed:
Jan. 24, 2000
Applicant:
Inventors:
David John Ritchie, Stirlingshire, GB;
Hannah Sallie Robertson McCann, Stirlingshire, GB;
Jennifer Ann White, Stirlingshire, GB;
Kirstin MacCormick, Stirlingshire, GB;
Raymond Vincent Heavon Jones, West Lothian, GB;
Robin Fieldhouse, Stirlingshire, GB;
Assignee:
ZENECA Limited, , GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
C07D / ;
Abstract
3-Isochromanone is prepared by contacting an o-xylene-&agr;,&agr;′-dihalide with carbon monoxide in a two-phase liquid medium, in which one phase is aqueous and the other phase is water-immiscible, in the presence of a catalyst and a hindered amine base.