BARIUM(II)-ION ASSISTED MONODEACETYLATION OF PARTIAL-CONE CALIX[4]ARENE-CROWN-5 DIACETATE - A CONVENIENT PREPARATION OF PARTIAL-CONE CALIX[4]ARENE-CROWN-5 MONOACETATE

The barium(II)-ion assisted monodeacetylation of p-cone calix[4]arene-crown-5 diacetate 4 in MeO-/MeOH is a fast and convenient method for the selective preparation of p-cone calix[4]arene-crown-5 monoacetate 5, which is not readily accessible by direct acetylation of the parent bis-phenolic compound.