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, Vol. 26, No. 3 471acetate and chloride. A singlet at δ 8.23 ppm was shiftedupfield slightly when benzoate, acetate or chloride wasadded, suggesting that those anions bind with outside OHprotons, which could disrupt the intramolecular hydrogenbond of OH protons resulting a slight upfield shift. Due tothe acidic protons on two hydroxyl groups, anion bindingwas inhibited considerably. But, a high selectivity for acetatewas observed when ligand

Synthesis, X-ray Structure and Anion Binding Properties of the Novel Urea Derivatives of Calix[4]arene Dimer