Selective synthesis of E -vinylsilanes and E , E -divinylsilanes via platinum-catalyzed hydrosilylation of alkynes with secondary silanes.

Platinum-N-heterocyclic carbene complex with the formula [Pt(IPr* ^OMe )(dvtms)] (where IPr* ^OMe = 1,3-bis{2,6-bis(diphenylmethyl)-4-methoxyphenyl}imidazol-2-ylidene, dvtms = divinyltetramethyldisiloxane) exhibits a high catalytic activity towards the β- E -selective hydrosilylation of terminal acetylenes with many secondary silanes (46 examples). Depending on the ratio of the reagent concentrations, the products of mono- or disubstitution are selectively obtained. Moreover, the one-pot sequential hydrosilylation of two different alkynes with secondary silane was also achieved over the same platinum catalyst.
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