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A perfect fit! The cavity of a chiral binuclear NiII complex recognises enantiomers of amino alcohols by recognising three different groups around the chiral carbon through non-covalent interactions (see scheme). The recognised enantiomer is recoverable from the cavity by metathesis with KNO3. Optical rotation of the isolated amino alcohol shows the enantiomer separation (ee) is 87 % in the first step and 100 % after metathesis.
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Sahoo et al. (2010) studied this question.
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