Silylmetallic compounds

Silylmetallic compounds can be prepared in synthetically useful quantities and used to generate new silicon-carbon bonds ... 

An important contribution to the chemistry of silylmetallic compounds has been made by Gilman and coworkers (25). 

Polysilanes have been prepared by the pyrolysis of a variety of silylmetallic compounds (54). 

A closely related synthetic method involves the addition of [C6H5(CH3)2Si]2CuLi to a-unsubsti-tuted a,/j-unsaturated carbonyl compounds to give anions 4 (R2 = h), followed by alkylation with haloalkanes18 I9. The stereochemistry of the alkylation is generally the same as that of the protonation (i.e occurs via 5 and 6) so that, in its overall effect, this method is complementary to the silylmetalation-protonation. 

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