Abstract
Two-electron reduction of dioxygen with an NADH model compound, 10-methylacridan (AcrH 2 ), occurs efficiently in the presence of metalloporphyrins and perchloric acid in acetonitrile at 298 K. Overall four-electron reduction of dioxygen by AcrH 2 has also been made possible by adding iodide ion to the metalloporphyrin-catalyzed system. The catalytic mechanisms are discussed on the basis of detailed kinetics and the kinetic isotope effects for the overall CoTPP + -catalyzed reduction of dioxygen by AcrH 2 as well as for each half catalytic cycle, the oxidation of AcrH 2 by CoTPP + and the reduction of dioxygen by CoTPP in the presence of HClO 4
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