1,4-二锂四苯基-1,3-丁二烯与卤代烃反应的研究(Ⅱ)——与溴甲烷的反应

Studies on the Reaction of 1,4-Dilithio-1,2,3,4-Tetraphenyl-1,3-Butadiene with Carbon Halide(Ⅱ)——Reaction with Methyl Bromide

1,4-二锂四苯基-1,3-丁二烯与溴甲烷反应生成顺,顺-和顺,反-2,3,4,5-四苯基-2,4-己二烯。其分子结构和比例由MS、NMR及X射线单晶分析所确定。讨论了产物的生成途径。

Cis, Cis(Ⅲ ) and Cis, trans(Ⅳ) isomers of 2,3,4,5-tetraphenyl-2,4-hexandiene are obtained from the reaction of 1, 4-dilithio-1,2,3, 4-tetraphenyl-1, 3-butadiene ( I ) with methyl bromide. The reaction path is studied. The molecular structures and the ratio of the isomers were determined by MS, NMR and single crystal X-ray diffraction. 1 belongs to the monoclinic, space group P2/n with the unit cell parameters of a= 6. 567(3), 6=7.608(2), c=22. 078(6) A , β=94.29 (3) and Z=2. IV belongs to the monoclinic, space group P21/c with the unit cell parameters of a = 12.256(2), 6=9.401(1) , c=19. 392(2) A , β=99. 35(1) and Z=4. Their final R-factors are 0. 074 and 0. 035 respectively.