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While the reduction of most α,β-unsaturated ketones with BH 3 :SMe 2 in the presence of (R)-B-methyl-4,5,5-triphenyl-1,3,2-oxazaborolidine [(R)-2] affords allylic alcohols of the S configuration, that of α,β-unsaturated ketones branched at both the α and α positions gives alcohols of the R configuration. Theoretical calculations on complexes of representative enones with BH ...
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