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:
Nov. 26, 1991
Filed:
Sep. 06, 1990
Applicant:
Inventors:
Keith R Motion, Hythe, GB;
Christopher P Newman, Canterbury, GB;
Assignee:
Unilever Patent Holdings B.V., Rotterdam, NL;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
568781 ; 568782 ;
Abstract
The invention relates to a process for the conversion of 8-hydroxymenthenes into 8-hydroxycymenes by reacting the 8-hydroxymenthenes in the liquid phase in the presence of a dehydrogenation catalyst, e.g. palladium and a hydrogen acceptor e.g. mesityl oxide. The process is preferably carried out at 80.degree.-150.degree. C. and in the presence of base. The process is particularly suitable for converting 8-hydroxy-p-menth-1-ene into 8-hydroxy-p-cymene. The reaction products are of value as intermediates in the preparation of fragrance chemicals.