The new tailored tetrahydroxycyclophane 4b is shown to be a selective host compound for piperazine 6 and structurally related diamines 7 and 8; association constants for the 1 : 1 complexes have been measured by 1H NMR titration experiments.
F. Vögtle and R. Hoss, J. Chem. Soc., Chem. Commun., 1992, 1584 DOI: 10.1039/C39920001584
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