Platinum-Catalyzed One-Pot Alkenylation of Aldehydes Using Alkynes and Triethylsilane: Dual Catalysis by Platinum(II) Chloride

The PtCl₂-catalyzed hydrosilylation of terminal alkynes with triethylsilane and subsequent alkenylation of aldehydes with the resultant (<i>E</i>)-alkenylsilanes in a one-pot manner are described. By adding <i>p</i>-benzoquinone and LiI, the latter alkenylation step proceeds smoothly to give allyl silyl ethers in moderate to high yields. This one-pot alkenylation is tolerant to a reasonable range of functional groups. PtCl₂ plays a dual role as hydrosilylation and alkenylation catalysts