用气相色谱分析研究由Me2SiCl2与Li合成(Me2Si)6的反应

A STUDY OF THE REACTION OF Me2SiCI2 WITH Li FOR SYNTHESIS OF(Me2Si)6 BY GAS CHROMATOGRAPHY

用气相色谱分析由MeSiCl(1)与Li在各阶段反应的生成物,发现除偶联反应外,还有环化、环转化平衡、聚合和裂解等反应,它们随反应条件的改变而变化.当反应液中含有催化量的MeSiSiPh(2)时,可以促进热力学稳定的(MeSi)的生成,进一步证明了亲核试剂对合成(MeSi)的催化作用.在一定的反应条件下,产物的收率达80%以上.

Using GC to follow the course of the coupling reaction of MeSiClwith Li,we have found that other reactions,including cyclization,ring intereonversion,polymerization and depolymerization,occurred and oould be oontrolled under some circumstances.In order to increase the yield of(MeSi),PhSiSiMewas added as a sourse of PhSianions.The latter species catalyzes equilibration of the reaction to give mainly the thermodyna-mically favored produet(MeSi).