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

Abstract

Abstract: 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, NMRand 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)Å, β=94.29 (3) and Z=2.IVbelongs 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)Å, β=99.35(1) and Z=4.Their final R-factors are 0.074 and 0.035 respectively.

Key words: Organolithium, Alkylation, Crystal structure

TrendMD:

Huan Zhenwei, Liu Weiguo, Gao Zhenheng, Yao Xinkan, Wang Honggen. Studies on the Reaction of 1,4-Dilithio-1,2,3,4-Tetraphenyl-1,3-Butadiene with Carbon Halide(Ⅱ)——Reaction with Methyl Bromide[J]. Chem. J. Chinese Universities, 1989, 10(7): 713.

References

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