Characterization of new mesomeric betaines arising from methylation of imidazo[2,1-c][1,2,4]triazin-4(1H)-one, pyrazolo[5,1-c][1,2,4]triazin-4(1H)-one, and 1,2,4-triazolo[5,1-c][1,2,4]triazin-4(1H)-one
and 3-diazopyrazole with 1,1-dimethoxyethene affords azolo-as-triazines (1c), (3c), and (8c), respectively; the involvement as intermediates of either aziridines (d), arising from a ‘nitrene-like reaction’ of diazoazoles, or azoalkenes (b) should be questioned at present.
Characterization of new mesomeric betaines arising from methylation of imidazo[2,1-c][1,2,4]triazin-4(1H)-one, pyrazolo[5,1-c][1,2,4]triazin-4(1H)-one, and 1,2,4-triazolo[5,1-c][1,2,4]triazin-4(1H)-one