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:
Jan. 08, 1980
Filed:
Jul. 20, 1978
Applicant:
Inventors:
Andrew H Renfrew, Blackley, GB;
Stephen B Bostock, Blackley, GB;
Assignee:
Imperial Chemical Industries Limited, London, GB;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
2603 / ;
Abstract
Process for the preparation of homogentisic lactone by reacting hydroquinone with a di(lower alkyl) chloro (or bromo) malonate and an alkali metal lower alkoxide to give an alkali metal 3-carbo(loweralkoxy)-5-hydroxy-2-oxidobenzo[b]furan which is subsequently decarboxylated by treatment with a strong mineral acid to give homogentisic lactone. The latter is readily converted into homogentisic acid by conventional means.