solution gave cyclic polysilanes, (Me2Si)n where n = 5–7. Decomposition of the disilane in the presence of diphenylacetylene afforded a trisilacyclopentene derivative under similar conditions. This compound was obtained also by the reaction between α,ω-dimethoxypermethylpolysilanes and diphenylacetylene in the presence of sodium methoxide. These cyclic products most likely were formed via permethyl polysilyl
                                    在
甲醇钠催化量的存在,符号-dimethoxytetramethyldisilane转化为α,ω-dimethoxypermethylpolysilanes,的MeO(森达2)ñ OME其中Ñ ⩾3,在室温下。另一方面,在THF溶液中对乙
硅烷进行类似处理,得到环状聚
硅烷(Me 2 Si)n,其中n= 5–7。在二
苯乙炔的存在下,乙
硅烷的分解在相似条件下提供了三
硅环戊烯衍
生物。该化合物也是通过α,ω-二甲氧基过甲基聚
硅烷与二
苯乙炔在
甲醇钠存在下的反应获得的。这些环状产物很可能是由衍生自α,ω-二甲氧基全甲基聚
硅烷的全甲基聚甲
硅烷基阴离子中间体形成的。同样,α,ω-二甲氧基全甲基聚
硅烷的形成可以通过涉及碱辅助的,一致的亲核取代或被甲
硅烷基阴离子逐步取代的机理来阐明,而不是随后的二甲基甲
硅烷基(Me 2 Si :)插入反应来阐明。