Diethyl carbonate is a carbonate ester of carbonic acid and ethanol with the formula OC(OCH2CH3)2. At room temperature (25°C) diethyl carbonate is a clear liquid with a low flash point.
Diethyl carbonate is used as a solvent such as in erythromycin intramuscular injections. It can be used as a component of electrolytes in lithium batteries.