Asymmetric calix(4)arenes (5) consisting of three different phenolic units were obtained by fragment condensation either of a trinuclear compound (1) with a 2,6-bis(bromomethyl)phenol (2) or a dinuclear compound (3) with a bisbromomethylated dimer (4) in a dioxane–TiCl4 system.
V. Böhmer, L. Merkel and U. Kunz, J. Chem. Soc., Chem. Commun., 1987, 896 DOI: 10.1039/C39870000896
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