Calix[4]arene crown-6 ethers derived from dideoxygenated calix[4]arene exhibit enhanced extraction selectivity for caesium over potassium; the crystal stucture of the uncomplexed calix[4]arene monobenzocrown-6 ether exists in the 1,3-alt conformation in the solid state.
R. A. Sachleben, A. Urvoas, J. C. Bryan, T. J. Haverlock, B. A. Moyer and B. P. Hay, Chem. Commun., 1999, 1751 DOI: 10.1039/A905682C
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