One-step synthesis of 2,5-dihydroxyterephthalic acid by the oxidation of p-xylene over M-MCM-41 (MÂ =Â Fe, Fe/Cu, Cu) catalysts

p-Xylene was converted into 2,5-dihydroxyterephthalic acid instead of conventional terephthalic acid by Cu-MCM-41 (Cu:Si = 1:100) under mild reaction conditions.63