- A facile synthesis of energetic salts based on fully nitroamino-functionalized [1,2,4]triazolo[4,3-b] [1,2,4]triazole
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A novel family of fully nitroamino-functionalized [1,2,4]triazolo[4,3-b][1,2,4]triazole-based energetic salts were synthesized. All salts were characterized by IR and multinuclear NMR spectroscopy, thermal analysis and elemental analysis. The crystal structures of salts 5, 6, and 7 were confirmed by single-crystal X-ray diffraction. The densities of these salts are between 1.65 (4) and 1.89 g cm-3 (3), whilst their oxygen balances are between -42.8% (7) and -11.3% (3). Theoretical performance calculations (Gaussian 09 and EXPLO 6.01) provided detonation pressures and velocities for salts 2-7 in the ranges of 27.6-41.1 GPa and 8519-9518 m s-1, respectively, which make them competitive energetic materials.
- Bian, Chengming,Feng, Wenjing,Lei, Qunying,Huang, Haifeng,Li, Xia,Wang, Jianlong,Li, Chuan,Xiao, Zhongliang
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- 1,3-diaminoguanidine-2,4,5-trinitroimidazole salt and preparation method thereof
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The invention discloses a 1,3-diaminoguanidine-2,4,5-trinitroimidazole salt and a preparation method thereof, belongs to the technical field of organic energetic materials and aims at solving the problem in the prior art that a TNT-based melt-cast explosive harms the environment in the use process. The method comprises the steps of using imidazole as a reaction raw material to generate 2,4,5-trinitroimidazole through step-by-step nitrification; enabling a nitrification product to react with a potassium carbonate/potassium chloride solution to form a salt to prepare 2,4,5-trinitroimidazole potassium salt; and finally obtaining a target product 1,3-diaminoguanidine-2,4,5-trinitroimidazole salt through double-decomposition reaction of 1,3-diamino guanidine hydrochloride and the 2,4,5-trinitroimidazole potassium salt. The preparation method is simple, low in preparation cost and good in security; and the final product 1,3-diaminoguanidine-2,4,5-trinitroimidazole salt is high in purity.
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Paragraph 0019
(2017/07/20)
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- PROCESS FOR STRAIGHTENING KERATIN FIBRES WITH A HEATING MEANS AND DENATURING AGENTS
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The invention relates to a process for straightening keratin fibres, comprising: (i) a step in which a straightening composition containing at least two denaturing agents is applied to the keratin fibres, (ii) a step in which the temperature of the keratin fibres is raised, using a heating means, to a temperature of between 110 and 250° C.
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- An Improved Synthesis of 3,6-Diamino-1,2,4,5-tetrazine. I
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Treatment of 1,3-diaminoguanidine monohydrochloride (1) with 2,4-pentanedione (2) in alcohols under carefully controlled conditions gave 3,6-diamino-1,2-dihydro-1,2,4,5-tetrazine monohydrochloride (3) in 45-50percent yields along with 3,5-dimethyl-1H-pyrazole (4) and its hydrochloride 5.Oxidation of 3 with sodium perborate produced 3,6-diamino-1,2,4,5-tetrazine (6) in quantitative yield.
- Coburn, Michael D.,Ott, Donald G.
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p. 1941 - 1945
(2007/10/02)
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