Silicon compounds carbonyl group alkenation

Peterson Alkenation. Trimethylsilylmethylmagnesium chloride (1) reacts with carbonyl compounds to give /3-hydroxysilanes (2).2>4,s silanes can then be eliminated to provide an alkene under acidic or basic conditions, such as with sodium hydride or potassium hydride (eq l).ia>ib,s,6 -pj g giinunation can also be accomplished by acetyl chloride or thionyl chloride. For the introduction of ex o-methylene groups, reagent (1) has been found to be superior to a Wittig approach the silicon reagent reacts rapidly and the byproduct is simple to remove. ... 

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