Polarity-reversal catalysis by thiols of radical-chain hydrosilylation of alkenes
作者:Hai-Shan Dang、Brian P. Roberts
DOI:10.1016/0040-4039(95)00372-j
日期:1995.4
The radical-chain hydrosilylation of alkenes by triethylsilane under very mild conditions is promoted by thiols, which act as polnrity-reversal catalysts for the abstraction of electron-rich hydrogen from the silane by nucleophilic beta-silylalkyl radicals.
Chemoselective Cleavage of Si–C(sp<sup>3</sup>) Bonds in Unactivated Tetraalkylsilanes Using Iodine Tris(trifluoroacetate)
However, the typical inertness of unactivated Si-C(sp3) bondsunder conventional reaction conditions has hampered the application of simple tetraalkylsilanes in organic synthesis. Herein we report the chemoselective cleavage of Si-C(sp3) bonds of unactivated tetraalkylsilanes using iodine tris(trifluoroacetate). The reaction proceeds smoothly undermildconditions (-50 °C to room temperature) and tolerates