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The syntheses of four new calix[4]arene receptors, i.e. 4-7, each of which contains an oxahexacyclic cage moiety, are reported. The structures of two of these receptors, i.e. 4 and 7, have been established via single crystal X-ray structural analysis. The complexation properties of 4-7 were determined via a series of alkali metal picrate extraction experiments. Two of the cage-functionalized calix[4]arene-crown-5...
The mono-potassium salts obtained by the action of K 2 CO 3 on calix[4]arene and p-tert-butylcalix[4]arene are found to possess very similar solid-state dimer structures that differ only in the presence of a cation-π interaction in the former. The mono-potassium salt obtained by the action of KOSiMe 3 on p-tert-butylcalix[4]arene, on the other hand, is found to possess a monomeric...
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