Full N,N-Methylation of 4,4′-Methylenedianiline with Dimethyl Carbonate: A Feasible Access to 4,4′-Methylene bis(N,N-Dimethylaniline)

Figure 4

Liquid chromatograms obtained after the reaction between MDA and DMC under different reaction times. Reaction conditions: DMC 27.0 g (0.30 mol), MDA 1.98 g (0.01 mol), NaY 1.98 g, and reaction temperature 190°C. (NaY)/(DMC) (g/g) = 0.07/1.