The chiral 18-crown-6-tetracarbonyl-[1]-cryptands (3), (5), and (6) are molecular receptors for primary ammonium salts, forming stable complexes whose stability and selectivity depends on interactions with the side chains of the ligands.
J. Behr, J. Lehn and P. Vierling, J. Chem. Soc., Chem. Commun., 1976, 621 DOI: 10.1039/C39760000621
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