Richard A. Sachleben, Agathe Urvoas, Jeffrey C. Bryan, Tamara J. Haverlock, Bruce A. Moyer and Benjamin P. Hay
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.