The tris-crown host compounds (1)–(4) were synthesized and the structures of (2) and of the 3:1 potassium complex of (1)(with the SCN- anion projecting inside the cavity) were studied by X-ray analyses; specific organic guest molecules like β-naphthol and naphthalene diols are selectively bound inside the fitting cavities of the hosts (2) and (3)[but not (1) and (4)] in acidic water solution.
F. Vögtle, A. Wallon, W. M. Müller, U. Werner and M. Nieger, J. Chem. Soc., Chem. Commun., 1990, 158 DOI: 10.1039/C39900000158
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