Nitration of the imidazo[1,2-a]pyridines (1) or (2), or (5) or (6), and (9) with nitric and sulphuric acids gives the pyridinium dinitromethylides (4a), (8), and (10), respectively, in which the pyridinium and dinitromethylide groups are orthogonal.
E. Andréasson, C. G. Newton, W. D. Ollis, C. W. Rees, D. I. Smith and D. E. Wright, J. Chem. Soc., Chem. Commun., 1983, 816 DOI: 10.1039/C39830000816
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