Mass Spectra of N-AIkyI- and N-BenzylPhenanthro[9, 10-d]triazoles

Abstract

N-Benzylation of phenanthro[9, 10-d]triazole gave the mixture of 1-benzyl-1H- and 2-benzyl-2H-phenanthro[9, 10-d]triazole (1c and 2c) such as N-Alkylation. The mass specctrometry can be used to distinguish clearly between the 1-alkyl-1H- and 2-alkyl-2Hphenanthro-[9, 10-d]-triazole. The 1-alkyl compound releases more N₂H, which is further split with the (R-H) elimination to give base peak m/z 190, than do the 2-isomer, and so on the mass spectrun of 2-alkyl compound a base peak is parent peak. However the fragmenta tion patterns of the two benzyl compounds show similarities so structures are proposed for these fragment ions by consideration of rearrangement fragment C₁₄H₈N⁺(m/z 190) and C₆H₅CH₂⁺ (m/z 91).