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Ultrasound-Promoted Reduction of Conjugated Enones, α-Diketones and Acyloins with NaBH4 under Aprotic Condition

A variety of conjugated enones are reduced regioselectively to their corresponding allylic alcohols with NaBH4 under ultrasound irradiation. Reduction reactions were performed in THF at room temperature and the product alcohols were obtained in high to excellent yields. This system is also efficient for the reduction of α-diketones and acyloins to vicinal diols.