In the presence of catalytic amounts of platinum(II) chloride and silver(I) hexafluoroantimonate, (Z)-alkenylsilanes reacted with various carbon electrophiles (acetals, aminals, carboxylic anhydrides, alkyl chlorides, etc.) at the γ-position to give allylation products. A plausible mechanism for the platinum-catalyzed allylation involves alkene migration of alkenylsilanes to allylsilanes and subsequent allylation of carbon electrophiles, both of which are catalyzed by a cationic platinum(II) species.
Three procedures for the allylation of acetals and aminals with (Z)‐1‐trimethylsilylalkenes are elaborated: direct allylation, three‐component reaction of the respective aldehyde, orthoformate or carbamate, and silylalkene, and pretreatment of the silylalkene followed by addition of acetal or aminal.
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