Abstract
The hydrocarbon-soluble coordination complex [Fe(4,7-diphenyl-1,10-phenanthroline) 3](SO 3CF 3) 2 ( 1) is an active catalyst for the autoxidation of cumene and cyclohexane. The activity of 1 in the autoxidation of cumene at 60 °C is comparable to that of tetra(pentafluorophenyl)porphyrin iron(III) chloride ( 2), a halogenated iron porphyrin with high autoxidation activity. The kinetic data have been fit by a mechanism in which the iron catalyst is activated by reaction with peroxide and the resulting active complex acts as a peroxide decomposition catalyst producing chain-carrying radicals. The activity of 1 is also comparable to that of 2 in the autoxidation of cyclohexane at 135 °C. The utility of catalyst 1 is enhanced by its solubility in pure hydrocarbon substrates.
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