Dioxazolone

In organic chemistry, a dioxazolone is a cyclic carbonate incorporated into C2NO2 ring. It is an uncommon heterocyclic compound. They arise by the phosgenation of hydroxamic acids:
 * RC(O)NHOH +  COCl2  →   RC=NO2CO  +  2 HCl

Although dioxazolones are often explosive, they are of interest as precursors to isocyanates:
 * RC=NO2CO →  R-N=C=O  +  CO2

Dioxazolones have attracted attention as reagents for the preparation of amides.