The title isomeric hosts (1) and (2), adopting different molecular conformations, form distinct types of closed cage accommodating the common guest 1,4-dioxane; it is remarkable that the symmetrical multimolecular cage structure of (1), not consolidated by hydrogen bonding, can exist even in the absence of guest.
D. D. MacNicol, P. R. Mallinson and C. D. Robertson, J. Chem. Soc., Chem. Commun., 1985, 1649 DOI: 10.1039/C39850001649
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