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Mono,arenes in the cone, partial cone and 1,3-alternate conformations have been synthesised and their complexation ability towards selected anions has been studied. The structure-anion complexation ability relationship has been systematically monitored. A new type of very efficient ligands based on diureido-calix [4]arene in a 1,3-alternate conformation with pronounced bonding ability towards carboxylates was designed.

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Alkylation of thiacalix[4]arenes with ethyl bromoacetate led to high yields (≈60%) of corresponding tetraacetates in various conformations (cone, partial cone, 1,3-alternate) depending strictly on the carbonate (Na, K, Cs) used for the reaction. The complexation ability of new compounds was studied by 1H NMR.