Macrocycle 2, which is obtained in 86% yield from calixarene analogue 1 by Birch reduction, does not undergo intramolecular benzene-ring rotation between room temp, and 125 °C according to variable temperature (VT) NMR experiments and derivative 3 is an ionophore for alkali metals, transition metals and lanthanoids.
Y. Okada, Y. Kasai, F. Ishii and J. Nishimura, J. Chem. Soc., Chem. Commun., 1993, 976 DOI: 10.1039/C39930000976
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