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

Table 4

Reuse of NaY zeolite catalyst.

Run	MDA conversion (%)	MBDMA yield (%)
1	100	97
2	100	94
3	100	90

Reaction  Conditions. DMC 27.0 g (0.30 mol), MDA 1.98 g (0.01 mol), NaY 1.98 g, reaction time 6 h, and reaction temperature 190°C. (NaY)/(DMC) (g/g) = 0.07/1.