1,3-Dialkoxycalix[4]arenes 1–3 in Et2O give diacetylated derivatives in the fixed cone conformation with AcCl/NaH, whereas the stereoisomeric compounds in the partial cone structure are produced in high yield using AcCl/EtOTl.
A. Casnati, A. Pochini, R. Ungaro, R. Cacciapaglia and L. Mandolini, J. Chem. Soc., Perkin Trans. 1, 1991, 2052 DOI: 10.1039/P19910002052
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