Allylations of various carbon electrophiles such as carbonyl compounds, acetals, and α,β-enones with allylstannanes promoted by bis(diethylaluminum)sulfate or boron trifluoride etherate are described. Merits and demerits of using allylstannanes in syntheses instead of allylsilanes are also discussed.
Irradiation of aromatic carbonylcompounds and allyl-, 2-methyl-2-propenyl-, or 3-methyl-2-butenyltrimethylstannanes in acetonitrile afforded δ,γ-unsaturated alcohols as major product. A photoinduced electron transfer mechanism is proposed for the allylations.