Synthesis,Molecular Structure,and Reactivity of the Isolable Silylenoid with a Tricoordinate Silicon

摘要

Silylenoids,R_2SiXM (X = halogen,M = alkali metal),are important intermediates in many reactions.Yet,in contrast to the extensively studied analogous carbenoids,R_2CXM,they have been little studied.Due to their high reactivity via self-condensation or alpha-elimination of MX producing reactive silylenes,very little is known about their molecular structure.Such structural information is important for understanding the intriguing multiple reactivity of halosilylenoids toward nucleophiles,electrophiles,and silylene trapping agents.An X-ray molecular structure is available only for a dimeric form of a methoxysilylenoid.Other known stable silylenoids include thio-and halosilylenoids,for which,however,there is no structural data.