The chiral diaza-18-crown-6 derivatives (7) and (8), which are readily synthesised from the corresponding optically active α-amino-acids or derived amino-alcohols (1), form complexes with primary alkyl-ammonium salts in non-polar solvents; enantiomer recognition in complex formation depends upon the substituents R3 on the ring nitrogen atoms.
D. J. Chadwick, I. A. Cliffe, I. O. Sutherland and R. F. Newton, J. Chem. Soc., Chem. Commun., 1981, 992 DOI: 10.1039/C39810000992
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