SCHEDULED MAINTENANCE
Cyclic urea units bound to anisyl or methylene units have been incorporated into 20-membered ring hosts whose complexation of alkali metal and ammonium ions show high binding free energies, high extraction rates, and high ion selectivities.
D. J. Cram and I. B. Dicker, J. Chem. Soc., Chem. Commun., 1982, 1219 DOI: 10.1039/C39820001219
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