“…Compared with other hydrogen donors in transfer hydrogenation, alcohol is the most attractive for this type of reduction reaction because of its low price and toxicity. [4] Recently, some transition metal catalysts (e. g., Ru, [5] Ir, [6] Os, [7] Rh, [8] Fe, [9] Ni, [10] and Mn [11] ) have been established for the transfer hydrogenation of ketones with alcohol. Ethanol has been identified as the best H-donor among various alcohols because of its low toxicity and sustainability.…”