Photolysis of tris(trimethylsilyl)silane: trapping of sisyl radicals
作者:Mustafa Mohamed、Michael A Brook
DOI:10.1139/v00-085
日期:2000.11.1
The photolysis of tris(trimethylsilyl)silane (TTMSS) was studied in the absence and in the presence of added trapping agents such as alkenes and alcohols. It was found that, unlike the case with pyrolysis, silyl radicals rather than silylenes are produced. They may be efficiently trapped with alkenes, to give the hydrosilylation products, but not with alcohols. The major product from the photolysis
Tris(trimethylsilyl)silane adds across the double bond of a variety of mono-, di-, and trisubstituted olefins under free-radical conditions in good yields. The reaction, which proceeds via a free-radical chain mechanism, is highly regioselective (anti-Markovnikov). Addition to prochiral olefins bearing an ester group is highly stereoselective. The factors that control the stereochemistry have been discussed terms of preferred conformations of the intermediate carbon-centered radicals and are thought to be of steric origin.
CHATGILIALOGLU, C.;GIESE, B.;KOPPING, B., TETRAHEDRON LETT., 31,(1990) N2, C. 6013-6016