The preparations of 4,5-diiodoimidazole and 2,4,5-triiodoimidazole from imidazole were reinvestigated and convenient procedures for excellent yields described. 2,4,5-Triiodoimidazole can be selectively converted to 2,4(5)-dinitro-5(4)-iodoimidazole and 2,4,5-trinitroimidazole by nitrolysis. 2,4(5)-Dinitroimidazole was converted by nitration into 2,4,5-trinitroimidazole and isolated as the imidazolium and potassium salts in 38% and 15% yields respectively.
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Katritzky et al. (1993) studied this question.
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