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Oxepine is an oxygen-containing heterocycle consisting of a seven-membered ring with three . The parent C6H6O exists as an equilibrium mixture with benzene oxide.
The oxepin–benzene oxide equilibrium is affected by the ring . A related dimethyl derivative exists mainly as the oxepine isomer, an orange liquid.
In nature, oxepine is an intermediate in the oxidation of benzene by the cytochrome P450 (CYP). Other are metabolites of the parent arene.
Benzene oxides are produced in the laboratory from dehydrohalogenation of the corresponding dihaloepoxide:
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