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2005
Reduction
O 0220
12- 050
γ-Cyclodextrin-Bicapped C60-Mediated Asymmetric Reduction of Ketones with
NaBH4. — Supramolecular asymmetric reduction of prochiral ketones (I) provides
chiral sec-alcohols (II) with moderate enantioselectivity. Although the mechanisms of
the effect of the bicapped fullerene and those of asymmetric induction are not yet clear,
it is assumed that hydride transfer to the carbonyl carbon is responsible for the formation of alcohol accompanied with the enantiotopos-differentiation in the hydrophobic
part. — (NISHIMURA, T.; NAKAJIMA, M.; MAEDA, Y.; UEMURA*, S.;
TAKEKUMA, S.-I.; TAKEKUMA, H.; YOSHIDA, Z.-I.; Bull. Chem. Soc. Jpn. 77
(2004) 11, 2047-2050; Dep. Energy Hydrocarbon Chem., Grad. Sch. Eng., Kyoto
Univ., Nishiyo, Kyoto 615, Japan; Eng.) — H. Hoennerscheid
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