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The vanadium(V)(salalen) complex prepared in situ from the corresponding vanadium(IV) complex 4 under aerobic conditions was found to be an excellent catalyst for asymmetric transcyanation of aliphatic aldehydes with acetone cyanohydrin as the cyanide source, showing high enantioselectivity of 91–95% ee.
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Takaki et al. (2008) studied this question.
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