Simplified preparations of trialkylsilyl- and bis(trialkylsilyl)dihalomethanes via the deprotonation of dihalomethanes
Simple, high-yield routes to trialkylsilyl- and bis(trialkylsilyl)dihalomethanes are described. These compounds are prepared by the deprotonation of dibromomethane or dichloromethane by lithium diisopropylamide in the presence of a chlorosilane. The reactions are carried out at temperatures below - 70°C in THF/hexane solvent mixtures. After aqueous workup, the air- and water-stable products are isolated by either distillation or crystallization. Further reactions on these compounds are possible, as illustrated by one example.
Yoon, Kunsang,Son, David Y.
p. 185 - 189
(2007/10/03)
Reactions of sterically hindered organozinc and organocadmium compounds containing functional silicon centres. Crystal structures of Zn2 and Cd2
The compound (Me3Si)2CCl2 was converted by treatment with BuLi/Et2O/THF and then with Me2HSiCl into (Me3Si)2CCl(SiMe2H).Further lithiation with BuLi gave LiC(SiMe3)2(SiMe2H), which reacted with ZnBr2 to yield Zn2.Thence, several new org
Al-Juaid, Salih S.,Eaborn, Colin,Habtemariam, Abraha,Hitchcock, Peter B.,Smith, J. David
p. 41 - 55
(2007/10/02)
Use of Sacrificial Anodes in Electrochemical Functionalization of Organic Halides
This article reviews the new possibilities in organic synthesis offered by the electroreduction of organic halides in the presence of various electrophiles using sacrificial metallic anodes.
Chaussard, Jacques,Folest, Jean-Claude,Nedelec, Jean-Yves,Perichon, Jacques,Sibille, Soline,Troupel, Michel
p. 369 - 381
(2007/10/02)
Electrosynthese en chimie organosilicique: silylation selective de polychloromethanes
Silylation by electroreduction of carbon tetrachloride, chloroform or methylene chloride is more selective than the common organometallic route.Me3SiCCl3 (94percent) and (Me3Si)2Cl2 (68percent) were thus obtained from CCl4, Me3SiCHCl2, (94percent) and (Me3Si)2CHCl (56percent) from CHCl3 and Me3SiCH2Cl (90percent) from CH2Cl2.Complete silylation of polychloromethanes was also successful by electrosynthesis and gave satisfactory yields.
Pons, P.,Biran, C.,Bordeau, M.,Dunogues, J.
p. 31 - 38
(2007/10/02)
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