A Generic One-Pot Route to Acyclic Two-Coordinate Silylenes from Silicon(IV) Precursors: Synthesis and Structural Characterization of a Silylsilylene

摘要

By comparison with their heavier Group 14 congeners, divalent silicon compounds are typically highly labile species with short lifetimes at ambient temperature. Consequently, the observation by West et al. in 1981 of the transient silylene, SiMes2 (Mes = 2,4,6-Me3C6H2), and its subsequent dimeriza-tion at 77 K to give the disilene, Mes2Si=SiMes2, represented a breakthrough in the evolution of modern main group chemistry. From that groundbreaking discovery until very recently, only silylene systems stabilized by incorporation into a cyclic framework, or by an augmented coordination number at silicon, had been reported. In early 2012, however, near simultaneous reports from our program and that of Power identified acyclic silylene systems that are stable at room temperature and above (Figure 1).