At pH 13 and room temperature, N-nitroso-2-(methylamino) acetonitrile (I) undergoes two unusually fast and successive hydrolytic changes that can be detected quantitatively by differential pulse polarography. The final hydrolysis product is N-nitrososarcosine (III), via the intermediate amide (11). The kinetics and activation parameters of the transformations have been determined. A mechanism has been proposed to account for these rapid ...