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Acetophenones o-substituted by halogen and methoxyl groups were hydrogenated in the presence of (NH 2 Et 2 ){Ru 2 Cl 5 [(S)-tol-BINAP] 2 } at 35°C and 85 kg/cm 2 hydrogen pressure. The results showed that o-bromoacetophenone was a very active substrate and its asymmetric hydrogenation gave an o-bromo-α-phenylethanol with very high enantioselectivity...
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