A new type of ligand system is reported which, by means of a rigid support structure, focuses the twenty-four electrons of six attached oxygens on an enforced cavity; the system complexes Li+ and Na+, but rejects other alkali or alkaline earth ions, solvents, and parts of its own support structure.
D. J. Cram, T. Kaneda, G. M. Lein and R. C. Helgeson, J. Chem. Soc., Chem. Commun., 1979, 948b DOI: 10.1039/C3979000948B
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