The kinetics of aerobic oxidation of cyclohexene catalyzed by Fe(III)(5,10,15,20-tetrakis(pentafluorophenyl)porphyrin)Cl in supercritical CO2 was studied at 50 degreesC and 165 atm of the total pressure with ca. 20 atm O-2 partial pressure. The reaction proceeded to yield allylic oxidation products, i.e. 2-cyclohexen-1-ol and 2-cyclohexen-1-one, and epoxidation products, i.e. cyclohexene oxide and 7-oxabicyclo[4,1,0]heptan-2-one. The reaction was retarded in the presence of radical inhibitor, 2,6-di-tert-butyl-4-methylphenol. The overall reaction rate under the steady state was dependent with ca. second order on the cyclohexene concentration, and zero order on the O-2 concentration except for the very small O-2 pressure range. These kinetic behaviors could be analyzed on the basis of the free radical allylic oxidation mechanism. (C) 2003 Elsevier B.V. All rights reserved.