In organic chemistry, a dioxazolone is a cyclic carbonate incorporated into C<sub>2</sub>NO<sub>2</sub> ring. It is an uncommon heterocyclic compound. They arise by the phosgenation of hydroxamic acids:
Although dioxazolones are often explosive, they are of interest as precursors to isocyanates:
Dioxazolones have attracted attention as reagents for the preparation of amides.