Heterogeneous carbonyl allylation by γ-substituted allylic alcohols with PdâSnCl2 in a nonpolar solvent such as diethyl ether was promoted by ultrasound to cause α-addition, with a regioselectivity which is the inverse of that in homogeneous carbonyl allylation in polar solvents such as dimethylformamide, 1,3-dimethylimidazolidin-2-one and tetrahydrofuranâH2O.
在非极性溶剂(如二
乙醚)中,γ-取代的
烯丙醇与 Pd-SnCl2 进行多相羰基烯丙基化,通过超声波促进引起 α-加成,其区域选择性与极性溶剂中的均相羰基烯丙基化相反。如二甲基甲酰胺、1,3-二甲基
咪唑烷-2-酮和
四氢呋喃·
H2O。