The selective and symmetrical 1,3,5-methylation of p-tert-butylcalix[6] arene 1 is achieved for the first time; subsequent introduction of ester and amide binding groups on the trimethoxy-p-tert-butylcalix[6]arene 2 fixes the calix in the cone conformation giving new preorganized cation ligands.
A. Casnati, P. Minari, A. Pochini and R. Ungaro, J. Chem. Soc., Chem. Commun., 1991, 1413 DOI: 10.1039/C39910001413
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