Abstract
Bromination of 3,6-dimethylbenzo[1,2-d:3,4-d′]diimidazole (Ia) in chloroform with bromine and dioxane dibromide in dioxane leads, through the intermediate formation of perbromides, to the 4-bromo-substituted derivative; 4,5-dibromo-3,6-dimethylbenzo[1,2-d:3,4-d′]dimidazole is formed in addition to a monobromo-substituted derivative by the action of potassium bromate in hydrobromic acid on Ia. Nitration of Ia and its 2,7-dimethyl-substituted derivative (Ib), even under severe conditions, leads to the 4-mononitro derivatives. Only one of the pyridine nitrogen atoms is quaternized by the action of excess methyl iodide on Ia, b.
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See [1] for communication II.
Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 1, pp. 107–110, January, 1973.
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Simonov, A.M., Koshchienko, Y.V. & Belenko, T.G. Benzo[1,2-d:3,4-d′] diimidazole derivatives. Chem Heterocycl Compd 9, 95–98 (1973). https://doi.org/10.1007/BF00476161
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DOI: https://doi.org/10.1007/BF00476161