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1 Central European Journal of Energetic Materials

1 2022

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Preparation of Imidazolium 2,4,5-Trinitroimidazolate from Derivatives of Imidazole and Its Oxidation Under Nitration Conditions

Lian Pengbao, Hou Changming, Chen Lizhen, Xu Jianxin, Xu Zishuai, Wang Jianlong

Central European Journal of Energetic Materials

2022

Vol. 19, no. 4

379--392

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.