METAL-ION CONTROL OF STEREOCHEMISTRY IN THE ACETYLATION OF CALIX[4]ARENE 1,3-DIETHERS

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.