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. 23, 2015
Filed:
Dec. 01, 2011
Hironori Maeda, Kanagawa, JP;
Hisanori Itoh, Kanagawa, JP;
Shinya Yamada, Kanagawa, JP;
Yoji Hori, Kanagawa, JP;
Hironori Maeda, Kanagawa, JP;
Hisanori Itoh, Kanagawa, JP;
Shinya Yamada, Kanagawa, JP;
Yoji Hori, Kanagawa, JP;
TAKASAGO INTERNATIONAL CORPORATION, Tokyo, JP;
Abstract
An object of the present invention is to provide a method for manufacturing an optically active menthol having fewer steps, which generates less environmentally polluting waste because a catalytic reaction is involved in all of the steps, and is capable of saving a production cost. The present invention relates to a method for manufacturing an optically active menthol, including the following steps: A-1) asymmetrically hydrogenating at least one of geranial and neral to thereby obtain an optically active citronellal, B-1) conducting a ring-closure reaction of the optically active citronellal in the presence of an acid catalyst to thereby obtain an optically active isopulegol, and C-1) hydrogenating the optically active isopulegol to thereby obtain an optically active menthol.