Armarego, W. L. F. published the artcileTriazaindenes (diazaindolizines). The site of protonation, Application of Imidazo[1,2-c]pyrimidine, the main research area is .
The syntheses of 1,3a,4-, 1,3a,5-, 1,3a,6-, and 1,3a,7-triazaindenes and their 2,3-dihydro derivatives are described. Ionization and uv spectra measurements indicate that in each case protonation occurs on N-1. Evidence is given that 1,2,3a- and 2-methyl-1,3,3a-triazaindene cations are also protonated on N-1, but 1,2,7a-triazaindene cation is protonated on N-2.
Journal of the Chemical Society published new progress about Protonation. 274-78-2 belongs to class imidazoles-derivatives, name is Imidazo[1,2-c]pyrimidine, and the molecular formula is C6H5N3, Application of Imidazo[1,2-c]pyrimidine.
Referemce:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem