Preparation of Imidazolium 2,4,5-Trinitroimidazolate from Derivatives of Imidazole and Its Oxidation Under Nitration Conditions
CENTRAL EUROPEAN JOURNAL OF ENERGETIC MATERIALS(2023)
Abstract
In this study, the nitration reactions of imidazole and its nitro derivatives with a mixture of 98% HNO3 and 98% H2SO4 (or 15% SO3 in H2SO4) were reinvestigated. When imidazole or 4(5)-nitroimidazole was nitrated with a mixture of 98% HNO3 and 98% H2SO4 (or 15% SO3 in H2SO4), only 4,5-dinitroimidazole was obtained. Imidazolium 2,4,5-trinitroimidazolate was prepared from 2-nitroimidazole or 2,4(5)-dinitroimidazole with a mixture of 98% HNO3 and 98% H2SO4 (or 15% SO3 in H2SO4); the highest yields were 57.8 and 62.8%, respectively. However, on increasing the reaction temperature, duration, amount of H2SO4 or HNO3, the by-product ethanedioic acid was produced. A possible reaction mechanism for the formation of ethanedioic acid from 2,4,5-trinitroimidazole is suggested. The compounds 4,5-dinitroimidazole, imidazolium 2,4,5-trinitroimidazolate and ethanedioic acid were characterized by infrared spectroscopy, multinuclear 1H and 13C NMR spectroscopy, and elemental analysis. The structures of 4,5-dinitroimidazole and ethanedioic acid were further confirmed by single-crystal X-ray diffraction
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Key words
imidazole,imidazole nitro derivatives,imidazolium 2,4,5-trinitroimidazolate,ethanedioic acid,nitration reaction,reaction mechanism
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