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:
Oct. 04, 1977
Filed:
Dec. 03, 1976
Applicant:
Inventor:
Kurt Mayer, Ludwigshafen, DT;
Assignee:
BASF Aktiengesellschaft, Ludwigshafen, DT;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07D / ; C09B / ; C07D / ;
U.S. Cl.
CPC ...
2603434 ;
Abstract
A process for the manufacture of ##STR1## where R and A are identical or different and each is alky of 1 to 4 carbon atoms, by oxidation of ##STR2## with air, oxygen or mixtures thereof, in an acid medium at a pH of from 1.5 to 5.5, at from 30.degree. to 150.degree. C. The reaction takes place rapidly and gives a good yield of the lactone (I), which can be freed from residual (II) by a treatment with alkali. The compound (I) is used as a dye intermediate in no-carbon copying systems.