A dioxetane or dioxacyclobutane is an organic compound with formula C₂O₂H₄, whose backbone is a four-membered ring of two oxygen atoms and two carbon atoms. There are two isomers:

• 1,2-dioxetane where the oxygen atoms are adjacent.
• 1,3-dioxetane where the oxygen and carbon atoms alternate.

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1,2-Dioxetane  · 1,3-dioxetane