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Published TCIMAIL newest issue No.198
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Useful Azeotropic Mixture Both as Solvent and Hydrogen Surrogate
No.184(Aug. 2020)
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)
References
- 1) Oxo-Tethered Ruthenium(II) Complex as a Bifunctional Catalyst for Asymmetric Transfer Hydrogenation and H2 Hydrogenation
- 2) Efficient Access to Chiral Benzhydrols via Asymmetric Transfer Hydrogenation of Unsymmetrical Benzophenones with Bifunctional Oxo-Tethered Ruthenium Catalysts
- 3) Catalytic Transfer Hydrogenation and Hydrogenolysis in Ionic Liquids with Pd/MgLa Mixed Oxide and Pd/MgAl Hydrotalcite as Recyclable Catalysts
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