The invention provides a novel method for the synthetic preparation of an ω-haloalkyne compound of the general formula R-C-C≡C(̵CH2)̵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 ω-halo-1-bromoalkyne compound of the formula X(̵CH2)̵n-C≡C-Br. The ω-haloalkyne compound obtained in the above can be readily converted to the corresponding alkenyl acetate of the formula R-CH=CH(̵ CH2+n-OCOCH3 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.
本发明提供了一种通过
格氏试剂RMgX'和式X(̵
CH2)̵n-C≡C-Br的ω-卤代-1-
溴炔烃化合物的偶联反应合成制备通式为R-C-C≡C(̵ )̵n-X的ω-卤代
炔烃化合物的新方法,其中X为卤素原子,R为一价烃基,n为4、5或6。上述得到的ω-卤代
烷烃化合物,在林德拉催化剂存在下,先乙酰化,再部分氢化,可以很容易地转化为相应的式 R-CH=CH(̵ +n-OCOCH3) 的烯基
乙酸酯。特别是 7,11-十六碳二烯
乙酸酯,它是一种有害昆虫的性信息素化合物,可以通过相同的合成路线,从 1-卤代-3-
辛烯和 1- 8-二
溴-
1-辛炔的
格氏试剂开始获得。