The phosphorylated calix[4]arenoid para- and meta-substituted cyclophane tetramers, which were synthesised in good yields starting from parent cyclic hydrocarbons, show a 'saddle-shaped' rigid conformation in solution, and the methylenephosphonic acid dialkyl ester groups are in a strategic position for complexation with neutral guests.
G. A. Consiglio, S. Failla and P. Finocchiaro, Mendeleev Commun., 1999, 9, 90 DOI: 10.1070/MC1999v009n03ABEH001109
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