After acid addition, one dicationic form with slightly enhanced diatropic features is obtained. Substituent's CH2 signals shift to -1.37, -1.47 ppm, and the macrocycle protons are in the range from 8.4 to 7.65 ppm [apart from N(2)CH3 and H (3)]. This also confirms the switchability of the keto-enol transformation in the methylated N-confused porphyrin.