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Useful Azeotropic Mixture Both as Solvent and Hydrogen Surrogate

 Formic acid - triethylamine (5:2) azeotrope (1) is utilized both as a solvent and as a hydrogen surrogate. Using a ruthenium catalyst (2, 3) in 1 solvent, asymmetric transfer hydrogenation of acetophenones1) or benzophenones2) proceeds with high yield and enantioselectivity. Using 1, reduction reactions can be performed without the need for flammable hydrogen gas or high-pressure equipment. 1 can also be utilized in dehalogenation reaction of aryl halides with a palladium catalyst.3)

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