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).
J. P. Riley, F. Heatley, I. H. Hillier, P. Murray-Rust and J. Murray-Rust, J. Chem. Soc., Perkin Trans. 2, 1979, 1327 DOI: 10.1039/P29790001327
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