A hemicarcerand composed of two bowls attached at their rims with four O(CH2CH2O)2 units, when heated with 22 guests containing 6–12 rigidly-arranged non-hydrogen atoms, formed 22 isolable, characterized hemicarceplexes, but failed to form isolable complexes with 34 other potential guests of the same molecular size range.
Y. Byun, O. Vadhat, M. T. Blanda, C. B. Knobler and D. J. Cram, J. Chem. Soc., Chem. Commun., 1995, 1825 DOI: 10.1039/C39950001825
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