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:
May. 18, 1976
Filed:
Aug. 27, 1973
Applicant:
Inventors:
Assignee:
Teijin Limited, Osaka, JA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
2606 / ; 2605 / ;
Abstract
This invention is directed to a process for preparing trimethylhydroquinone (TMHQ) by heating 4-hydroxy-2,4,6-trimethyl-2,5-cyclohexadiene-1-one (HTCD) in a nonacidic liquid medium consisting of either methanol or an aqueous medium, preferably in the presence of a basic substance, at a temperature of at least 100.degree.C., and preferably 150.degree.-300.degree.C. Thus, according to this invention, TMHQ of high purity and small coloration can be prepared from HTCD in good yield, for example, as high as 85 - 98%.