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A combined system of RuCl[(R,R)-YCH(C6H5)CH(C6H5)NH2](eta (6)-arene) (Y = N
SO2C6H4-4-CH3 or O) and t-C4H9OK catalyzes the asymmetric transfer hydrogen
ation of various benzaldehyde-1-d derivatives with 2-propanol to yield (R)-
benzyl-1-d alcohols in 95-99% ee and with >99% isotopic purity. Reaction of
benzaldehydes with a DCO2D-triethylamine mixture and the R,R catalyst affo
rds the S deuterated alcohols in 97-99% ee.