1,3-Dimethyl-2-imidazolidinone (DMI) is a cyclic urea used as a high-boiling polar aprotic solvent. It is colourless, transparent, highly polar and has high thermal and chemical stability.

In many applications, DMI can be used as a substitute or replacement for the carcinogenic solvent HMPA as well as toxic solvent NMP.

DMI has a boiling point of 225 °C, a flash point of 120 °C and a melting point of 8.2 °C.

DMI has excellent solvating ability for both inorganic and organic compounds.