Abstract
Benzoate modified calix[4]arenes 3–8 were synthesized from (o-bromomethyl)benzoate. EA, IR, 1H and 13C NMR characterizations showed that compounds 3, 4, 5, 7 and 8 were in cone conformation, while 6 was in a 1,3-alternate conformation. The solvent extraction experiments found that the cone-conformers 3 and 8 have high selectivity for K+ as compared to Na+. Compound 3 has an extractability of 69.8% for K+ and 7.1% for Na+. Compound 8 has an extractability of 80.9% for K+ and 19.1% for Na+. In order to elucidate the results, the complex behavior of compounds 3, 6 and 8 for K+ were studied by 1H NMR and the crystal structures of compounds 3 and 6 were determined.
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