Room-temperature aerobic formation of a stable aryl–Cu(iii) complex and its reactions with nucleophiles: highly efficient and diverse arene C–H functionalizations of azacalix[1]arene[3]pyridine

Under very mild aerobic conditions, azacalix[1]arene[3]pyridine underwent highly efficient C-H activation with Cu(ClO(4))(2).6H(2)O to form a stable aryl-Cu(III) complex which reacted rapidly with various nucleophiles at ambient temperature to afford diverse functionalized azacalix[1]arene[3]pyridine derivatives in excellent yields.