Mass spectral fragmentation patterns of various 6-substituted 2,4-bis-(m-aminoanilino)-s-triazines

The mass spectra of 6-substituted-2,4-bis-(m-aminoanilino)-s-triazines were determined and found to be dominated by intense molecular ions (base peak), strong M-H peaks and fragment ions diagnostic for the arylamino and C-6 substituents. Mechanisms have been proposed for the formation of the major peaks in the spectra. Fragmentation pathways involving hydrogen transfer reactions have been rationalized by concomitant opening of the triazine ring rather than an amino-imino tautornerization as previously suggested. Fragmentation reactions accompanied by rearrangement modes have also been encountered in some of the compounds studied.