Alkynes chlorodimethylsilane

Combining two different hydrosilylation catalysts in sequence with chlorodimethylsilane has allowed the construction of complex dye assemblies and conducting polymers. In the example shown (Scheme 8), Karstedt s catalyst was chosen after a brief screen for the hydrosilylation of an aromatic diyne with chlorodimethylsilane. After reduction of the chlorosilane, an equimolar mixture of disilane B and diyne A was treated with a catalytic amount of Wilkinson s catalyst, resulting in the formation of polymer C.42 Hydrosilylation of alkynes has also been studied as a means of synthesizing oligo(phenylenevinylene) units with pendant alkoxysilanes to create curable, hole-transporting films.43,43 ... 

The reaction of (1) with lithium diisopropylamide followed by treatment with chlorodimethylsilane was reported to give the dis-ilylketene (2) in a modest yield, instead of the expected alkynic ether (3) (eq 3). The hydridosilylketene (2) is transformed by flash vacuum thermolysis (FVT) to trimethylsilylacetylene by expulsion of dimethylsilanone. ... 

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