Highly Efficient,Catalytic Meerwein–Ponndorf–Verley Reduction with a Novel Bidentate Aluminum Catalyst

Double electrophilic activation of carbonyl groups allows a modern variant of the Meerwein–Ponndorf–Verley reduction to be carried out under mild conditions with bidentate catalyst 1 (see reaction). Various carbonyl substrates can be reduced efficiently at room temperature in CH₂Cl₂ with 2-propanol or sec-phenethyl alcohol in the presence of a catalytic amount of 1 . This system is also applicable to the Oppenauer oxidation of secondary alcohols to the corresponding ketones.