A bowl of pairs: The water-soluble bowl-shaped coordination compound formed from [Pd(en)(NO3)2] (en=ethylenediamine) and tris(3-pyridyl)triazine recognizes preferentially a racemic pair of guest molecules such as 1,1′-bi-2-naphthol. This bimolecular recognition results in chirality enrichment in the organic phase without the need to add another source of chirality (see scheme).
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Yoshizawa et al. (2007) studied this question.
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