Perepoxides
Perepoxides are epoxides with an additional oxygen atom attached to the epoxide-oxygen. They are isoelectronic and isostructural with the cyclic sulfoxides derived from episulfides. Perepoxides are proposed intermediates in the photosensitized oxidation of alkenes, as occurs when drying oils (a component of some paints and varnishes) are exposed to air in light. Such intermediates arise from the addition of singlet oxygen to the double bond. Perepoxides rapidly rearrange to allylic hydroperoxides.
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