Hydrosilylation of alkenes with early main-group metal catalysts.
Clean conversion of conjugated alkenes with exclusive formation of one regioisomer is achieved by using a new class of hydrosilylation catalysts based on early main-group metals (Ca, Sr, and K). The regioselectivity can be switched to the other isomer through the choice of the metal and solvent polarity. E.g., solventless hydrosilylation of CH2:CPh2 with PhSiH3 in presence of 2.5% of homoleptic L2Ca(THF)2 or L2Sr(THF)2 (L = o-Me2NC6H4CHSiMe3) at 50 Deg gave >98% conversion to PhH2SiCPh2Me, whereas the same reactions in THF gave >98% conversion to the other regioisomer, PhH2SiCH2CHPh2.
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