On the site of protonation of the 2-aminoimidazo[5,1-f][1,2,4]triazine system: X-ray, 13C nuclear magnetic resonance, and CNDO/2 studies
Abstract
The preferred site of protonation of the 2-aminoimidazo[5,1-f][1,2,4]triazine system has been studied by crystallographic, 13C n.m.r., and semi-empirical molecular orbital methods. In each case it is found that protonation occurs at N(6).