1.P. B. Talukar, S. K. Sengupta and A. K. Datta
Synthesis of mesoionic 3-p-nitrophenylimidazol[2,3-a]isoquinolinium 2-thione
Journal of the Chemical Society, Chemical Communications;
1972; 696
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http://dx.doi.org/10.1039/C39720000696Unusual synthesis of stable pyridinium dinitromethylides
Journal of the ChemicalSociety, Chemical Communications;
15; 1983; 816 - 817;
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http://dx.doi.org/10.1039/c39830000816A novel synthesis of the imidazo[1,2-a]pyridine ring system
J Chem Soc, Chem Commun
p. 1151, 1988
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http://dx.doi.org/10.1039/C39880001151Phenanthro[9,10-d]imidazole derivatives. The structure of Zincke's phenanthraquinone imide anhydride
Journal of the Chemical Society [Section] C: Organic;
1971; 1256;
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http://dx.doi.org/10.1039/j39710001256