13C-NMR as useful tool for unambiguous identification of ring substituted N1(2)(3)-alkylbenzotriazole isomers

Analysis of the chemical shifts of C-3a and C-7a angular atoms in the benzotriazoles bearing a substituent on the ring and an alkyl group on the nitrogen position of the triazole moiety proved to be a good tool for identification of the different N-alkyl isomers.