silylium ion 6. The silyl cation 8 is stabilized by the formation of an intramolecular Si-H-Si bridge, which also provides the thermodynamic driving force for its formation. In general, the preference for the formation of Si-H-Si bridges can be used to scavenge and identify transient intermediates in the Lewis acid induced rearrangement of polysilanes. The validity of this concept has been demonstrated
已发现 1,1-二氢环戊
硅烷 7 的电离产生环状聚
硅烷基甲
硅烷基阳离子 8,而不是预期的氢取代的
硅离子 6。甲
硅烷基阳离子 8 通过形成分子内 Si-H-Si 桥而稳定,该桥还为其形成提供了热力学驱动力。一般来说,优先形成 Si-H-Si 桥可用于清除和识别
路易斯酸诱导的聚
硅烷重排中的瞬时中间体。这一概念的有效性已在该
化学的一个核心步骤中得到证明,即环己
硅烷形成甲
硅烷基环戊
硅烷的缩环反应。