In an X-ray diffraction study of the isomers A and B′ of dicyclohexyl-18-crown-6 the oxygen atoms have been found to lie approximately in a plane, with the cavity elliptical in shape and the shorter distance across the ellipse slightly more than 4 Å.
N. K. Dalley, J. S. Smith, S. B. Larson, J. J. Christensen and R. M. Izatt, J. Chem. Soc., Chem. Commun., 1975, 43 DOI: 10.1039/C39750000043
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