N6, N9-Dimethyladenine (N6, N9-Me2Ade, 1) and N1, N4-dimethylcytosine (N1, N4- Me2Cyt, 3) were obtained by conventional methods, whereas the reaction of N6- benzyladenine with MeI/NaOH resulted in the formation of N3, N6-MeBnAde (2a) and N6, N9-BnMeAde (2b). All compounds were fully characterized by microanalysis, NMR spectroscopy (1H, 13C) and 1, 2a· 2MeOH and 3 also by single-crystal X-ray diffraction ...