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:
Jun. 28, 1988
Filed:
May. 08, 1986
Ernst-Joachim Brunke, Holzminden, DE;
Ludwig Tumbrink, Hoxter, DE;
Abstract
4,4,7-trimethyl-3,4,7,8-tetrahydro-2(6H)-naphthalen-one is obtained by an elimination reaction from 3-oxo-.alpha.-ionol by way of direct addition thereof to a solution of a protonic acid in an inert solvent at an elevated temperature, or following its conversion into a low-carbon alkyl ester, particularly acetate, by way of the treatment of the latter, preferably with sodium acetate, in a polar non-protonic solvent at 150.degree.14 300.degree. C., wherein the output can be increased by raising the temperature of reaction. The product of the process is suitable, in pure form or as mixed with simultaneously produced 3,5,5-trimethyl-4-butenylidene-cyclo-hex-2-en-1-one, as an odiferous substance or as a fragrant substance for foods and tobacco.