1.4-二锂-1,2,3,4-四苯基-1,3-丁二烯与卤代烃反应的研究(Ⅰ)——顺,顺-1,4-二溴-1,2.3.4-四苯基-1,3-丁二烯结构的确定

Study on the Reaction of 1,4-Dilitho-1,2,3,4-Tetraphenyl 1,3-Butadiene with Carbon Halide(Ⅰ)--The Molecular Structure of the Product,cis,cis-1,4-Dibromo-1,2,3,4-Tetraphenyl-1,3-Butadiene

1,4-二锂-1,2,3,4-四苯基-1,3-丁二烯与四溴化碳反应生成顺,顺-1,4-二溴-1,2,3,4-四苯基-1,3-丁二烯。其分子结构由MS、IR、NMR谱及X射线单晶分析确定。由于取代基间的空间排斥,产物分子发生很大的扭曲而不在同一个平面上。

Cis,cis-1,4-dibromo-1,2,3,4-tetraphenyl-1,3-butadiene is obtained from the reaction of 1,4-dilitho-1,2,3,4-tctraphenyl-1,3-buladicnc with carbon tetrabro-mide.The molecular structure of the product is determined by the results of elementary analysis,MS,IR,NMR and single crystal X-ray diffraction.That,the molecular structure of the product is not coplanar,is thought to be caused by the steric hindrance between the substituents.