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/Dowex1-x8 system in THF at room temperature. This system is also efficient for the conversion of α-diketones and acyloins to the vicinal diols in refluxing THF.Key Words : Sodium borohydride, Dowex1-x8, α,β-Unsaturated carbonyls, α-Diketones, AcyloinsIntroductionReduction of α,β-unsaturated carbonyl compounds bymetal hydrides can follow two pathways: addition to carbonylgroup (1,2-reduction) to give allylic alcohols or addition tothe conjugated double bond (1,4-addition) to give saturatedcarbonyl compounds. Due to importance of synthetic pre-cursors of allylic alcohols, the regioselective reduction ofα,β-unsaturated aldehydes and ketones seems to be aconvenient and easy way to obtain these compounds. So, thisachievement is synthetically very important.

Mild and Efficient Reduction of α,β-Unsaturated Carbonyl Compounds, α-Diketones and Acyloins with Sodium Borohydride/Dowex1-x8 System