N 1931 (OTTO) 2-Nitro propane, 98% Cas 79-46-9 - used to prepare 5,5-Dimethylpyrroline N-oxide and 5,5-di(trideuteromethyl)pyrroline N-oxide. N 1931 (OTTO) 2-Nitro propane, 98% Cas 79-46-9 - used as a solvent for organic compounds, coatings, inks, dyes.