1,3-Dimethyl and dipropyl ethers of p-t-butylcalix[4]arene and calix[4
]arenes have been converted to the corresponding diesters, acetate and
propionate, and their conformations are inferred based on the H-1 and
C-13 NMR spectra, The presence of t-butyl groups is effective in main
taining the cone conformation on derivatization.