The new calix[4]arene derivatives 6 and 9, which are both readily prepared from the cone conformations of calix[4]arene tetra-ethers, are both ionophores which show some Na+/K+ selectivity; the derivative 6 with two cation binding sites shows evidence for cooperativity between the two mechanically linked sites.
C. A. Gleave and I. O. Sutherland, J. Chem. Soc., Chem. Commun., 1994, 1873 DOI: 10.1039/C39940001873
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