Isomerism of 1- and 2-(NN-disubstituted aminomethyl)benzotriazoles; an investigation by nuclear magnetic resonance spectroscopy
Abstract
N.m.r. spectroscopy of a selection of (aminomethyl)benzotriazoles prepared by a standard Mannich reaction reveals the ready isomerism between 1- and 2-(aminomethyl)benzotriazoles. The proportions of the two isomers are sensitive to changes in solvent polarity but independent of temperature. In almost all the equilibria the 1-(aminomethyl)benzotriazole is the predominant isomer.