Calix[4]pyrrole bis-crowns as ion pair receptors: cation selectivity modulated by counter anions

A series of doubly strapped calix[4]pyrroles 2–4 with different sizes of crown ethers have been synthesized by the reactions of the meso -tetra-4-hydroxyphenylcalix[4]pyrrole (6) with tri-, tetra-, and penta-ethylene glycol ditosylates, respectively, in the presence of K 2 CO 3 as a base. Receptors...

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