The tricyclic host molecules (1) and (5) form inclusion complexes with bis-primary-alkylammonium salts (3) in which the n.m.r. spectrum of the guest salt reflects the symmetry of the host molecule in the complex; the hosts (1) are rigid and highly selective, whereas the host (5a) has one flexible bridge and selectivity is modified by this flexibility.
N. F. Jones, A. Kumar and I. O. Sutherland, J. Chem. Soc., Chem. Commun., 1981, 990 DOI: 10.1039/C39810000990
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