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:
Jul. 05, 1983
Filed:
May. 22, 1981
Schin-Etsu Chemical Co., Ltd., Tokyo, JP;
Abstract
The invention provides a novel method for the synthetic preparation of an .omega.-haloalkyne compound of the general formula R--C.tbd.C--CH.sub.2).sub.n X, in which X is a halogen atom, R is a monovalent hydrocarbon group and n is 4, 5 or 6, by the coupling reaction of a Grignard reagent RMgX' and an .omega.-halo-1-bromoalkyne compound of the formula X--CH.sub.2).sub.n C.tbd.C-Br. The .omega.-haloalkyne compound obtained in the above can be readily converted to the corresponding alkenyl acetate of the formula R--CH.dbd.CH--CH.sub.2).sub.n OCOCH.sub.3 by first acetylating and then partially hydrogenating in the presence of a Lindlar catalyst. In particular, 7, 11-hexadecadienyl acetate, which is a sexual pheromone compound of a noxious insect, is obtained in the same route of synthesis starting with the Grignard reagent of a 1-halo-3-octene and 1, 8-dibromo-1-octyne.