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Asymmetric reduction of prochiral aromatic ketones with the reagent prepared from (S)-(–)-2-amino-3-methyl-1,1-diphenylbutan-1-ol [(S)-(1)] and borane afforded the corresponding aromatic secondary alcohols in high optical (94–100% enantiomeric excess) and chemical (100%) yields.
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Itsuno et al. (1983) studied this question.
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