Add time:09/09/2019 Source:sciencedirect.com
We provide a new transfer hydrogenation of structurally diverse aldehydes and ketones in water using formic acid as hydride donor. The iridium complex of 4,4′,5,5′-tetrahydro-1H,1′H-2,2′-biimidazole, is used as the efficient catalyst. The S/C ratios in aldehyde and ketone reductions are as low as 20,000 and 10,000, respectively. The TOF value in aldehyde reduction is as high as 60,000 h−1. A number of functional groups such as (hetero)aryl, alkenyl, halogen, phenolic and alcoholic hydroxyls, trifluromethyl, cyano, nitro, ester, carboxylic acid, and acidic methylenes are well tolerated.
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