A chiral bipyridine derived from pinene was found to racemize in the presence of a copper(II) coordinating polymer. The possible racemization reason was examined by circular dichroism spectroscopy. Molecular protonation was determined as the key step of the conversion. Predicted co-crystal structure of a bipyridine and aromatic carboxylic acid mixture was confirmed by configuration roll-over of the pinene ring.
T. Wu, X. Zhang and X. You, RSC Adv., 2013, 3, 26047 DOI: 10.1039/C3RA45645E
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