Abstract
The arylcyclopropanes (cyclopropylarenes) cyclopropylbenzene and diphenylcyclopropane are oxidized by rabbit liver microsomal cytochrome P-450, both by the microsomal fraction and by the purified cytochrome in a reconstituted system. The products formed, principally benzoic acid, are due to an unusual triple oxidation of the substrate, which probably remains attached to the active site during the several steps of the oxidation. Both substrates were found to be inhibitors of the cytochrome P-450-dependent O-de-ethylation of 7-ethoxycoumarin. Model oxidation studies with cumene hydroperoxide as oxidizing agent and rabbit liver microsomal fraction as source of enzyme gave similar products to the microsomal and reconstituted systems. The significance of these results in the mechanism of oxidation catalysed by cytochrome P-450 is discussed.
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