The direct selective upper rim 1,3-formylation of conformationally rigid calyx[4]arenes is achieved for the first time; the diametrical bis(formyl)calix[4]arene 4 is used as a key intermediate for the synthesis of new cavitands.
A. Arduini, G. Manfredi, A. Pochini, A. R. Sicuri and R. Ungaro, J. Chem. Soc., Chem. Commun., 1991, 936 DOI: 10.1039/C39910000936
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