Tris(trimethylsilyl)silyl versus tris(trimethylsilyl)germyl: Radical reactivity and oxidation ability
作者:Jacques Lalevée、Nicolas Blanchard、Bernadette Graff、Xavier Allonas、Jean Pierre Fouassier
DOI:10.1016/j.jorganchem.2008.08.039
日期:2008.11
(TMS)3SiH toward the t-butoxyl, the t-butylperoxyl and the phosphinoyl radicals. A similar behavior is noted for an aromatic ketonetriplet state. II exhibits a lower absolute electronegativity: accordingly, the addition to electron rich alkenes is less efficient than for I. Radical II is also found less reactive for both the peroxylation (II+O2→II-O2) and the halogen abstraction reactions. The rearrangement
Preparation of tris (trimethylsilyl) silylethyl esters
申请人:——
公开号:US20010007909A1
公开(公告)日:2001-07-12
An industrially acceptable process for preparing 2-[tris(trimethylsilyl)silyl]ethyl (meth)acrylate in high yields involves reacting 2-[tris(trimethylsilyl)silyl]ethyl acetate with an alcohol in the presence of a catalyst to form 2-[tris(trimethylsilyl)silyl]ethanol, then reacting it with a (meth)acrylate ester.
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.
KULICKE, KLAUS JURGEN;GIESE, BERND, SYNLETT.,(1990) N, C. 91-92