Complexes between a macrocylic tetraamide and dicarbonyl substrates have been used to investigate the interaction of functional groups with the face of an aromatic ring; amide NH groups directed towards the π-electron density on the face of the ring produce a substantial increase in binding energy in chloroform which suggests that π-facial H-bonds can be important in molecular recognition.
H. Adams, F. J. Carver, C. A. Hunter and N. J. Osborne, Chem. Commun., 1996, 2529 DOI: 10.1039/CC9960002529
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