New calix[4]arenes with two N-(X)sulfonyl carboxamide groups of ‘tunable’ acidity are synthesized from the corresponding calixarene dicarboxylic acid and exhibit good to excellent extraction selectivity for Pb2+ over most alkali, alkaline earth and transition metal ions.
G. G. Talanova and H. Hwang, Chem. Commun., 1998, 419 DOI: 10.1039/A708150B
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