α-Regioselective carbonyl allylation by an allylic tin compound prepared from 1-bromobut-2-ene and tin(II) bromide at a nonpolar organic–aqueous interface
Abstract
1-Bromobut-2-ene on a dichloromethane–water biphasic system at 25 °C causes α-regioselective addition to aldehydes with SnBr2 to produce 1-substituted pent-3-en-1-ols, and causes γ-regioselective addition to aldehydes with SnBr2–Bu4NBr to produce 1-substituted 2-methylbut-3-en-1-ols.