1.10.3.1 2 catechol + O2 = 2 1,2-benzoquinone + 2 H2O - - 1.10.3.1 2 catechol + O2 = 2 1,2-benzoquinone + 2 H2O catalytic reaction mechanism of the enzyme in a copper(II) complex with a macrocyclic ligand 673046 1.10.3.1 2 catechol + O2 = 2 1,2-benzoquinone + 2 H2O the enzymes possesses a core carboxylate essential to activity, this enhanced catalytic efficiency of PPO 671857