Article révisé par les pairs
Résumé : A procedure using HClO4 and PbO2 allows the straightforward oxidation of para-substituted and unsubstituted calix[n]arenes into the corresponding calix[n]quinones in approximately 82 % yield per quinone unit. These mild conditions constitute a good alternative to the classical procedure that involves highly toxic thallium(III) salts in trifluoroacetic acid.