Control Factors of Two Reaction Modes of Pentacoordinate 1,2-Oxasiletanides, the Peterson Reaction and HomoBrook Rearrangement

Thermolyses of pentacoordinate 1,2-oxasiletanides with or without a neopentyl group at the 3-position in the presence of a proton source afforded the corresponding olefin and/or alcohol, indicating that they are the intermediates of both the Peterson reaction and homo-Brook rearrangement which are two possible modes in the reaction of (beta)-hydroxyalkylsilanes with bases.