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. 17, 1983
Filed:
Jul. 14, 1981
Shin-Etsu Chemical Co., Ltd., Tokyo, JP;
Abstract
The invention provides a novel synthetic method for the preparation of an alkyne-1 compound of the general formula R(CH.sub.2).sub.n C.tbd.CH, in which R is a monovalent hydrocarbon group and n is an integer of 4, 5 or 6, which compound is useful as an intermediate of various organic compounds or, in particular, of several sexual pheromone of noxious insects expected to give a promising means for the extermination of the insects. The method comprises reacting an .omega.-bromo-1-alkyne compound of the formula Br(CH.sub.2).sub.n C.tbd.CH, e.g. 8-bromo-1-octyne, with a Grignard reagent of the formula RMgX, e.g. cis-3-octenylmagnesium chloride, in tetrahydrofuran, preferably, in the presence of a catalyst which is dilithium copper tetrachloride or lithium copper dichloride.