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.
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