Trinitroethylorthocarbonate, also known as TNEOC, is an organic compound with the chemical formula . It is an oxidizer with excellent chemical stability. Its explosion point is 238 ðC, and it begins to be decomposed at 200 ðC. Its explosion heat is 5.797 J/g and specific volume is 694 L/kg. Its structure is closely related to that of trinitroethylorthoformate (TNEOF). Both are highly explosive and very shock-sensitive, and may be dissolved in nitroalkanes to reduce their shock-sensitivity.
TNEOC can be prepared by the reaction of trinitroethanol with carbon tetrachloride, catalyzed by FeCl<sub>3</sub>: