Syntheses of all possible conformational isomers of O-alkyl-p-t-butylcalix[4]arenes

Article abstract of DOI:10.1016/S0040-4020(01)87102-7

In p-t-butylcalix[4]arene (1H₄) and its mono-, di-, tri-, and tetra-O-alkyl derivatives (1HR₃, 1H₂R₂, 1HR₃, and 1R₄ respectively), 23 different homologs can exist (including 1H₄)