New Dichlorosilanes, Cyclotrisilanes, and Silacyclopropanes as Precursors of Intramolecularly Coordinated Silylenes

Reductive dehalogenation of pentacoordinate dichlorosilanes with magnesium is the most straightforward method to generate highly coordinated silylenes, which can be trapped effectively by a variety of substrates [Eq. (1)]. In the absence of trapping reagents either cyclotrisilanes, which are convenient thermal silylene precursors, or dimerization and rearrangement products of the intermediate silylenes are formed.