5213-50-3Relevant articles and documents
Study of the methylation reaction of 2,4-dinitroimidazole and potassium 2,4,5-trinitroimidazol-1-ide with dimethyl sulfate
Lian, Peng-Bao,Yuan, Yuan,Chen, Jian,Chen, Li-Zhen,Wang, Jian-Long
, p. 1010 - 1014 (2020/10/02)
[Figure not available: see fulltext.] The methylation of 2,4-dinitroimidazole and potassium salt of 2,4,5-trinitroimidazole with dimethyl sulfate was reinvestigated. When the reaction system contained a weak base, the reaction products were 1-methyl-2,4-dinitroimidazole and 1-methyl-2,4,5-trinitroimidazole, respectively. However, in the absence of a base in the reaction system, the products contained oxidation byproducts 1-methylimidazolidine-2,4,5-trione, 1,3-dimethylimidazolidine-2,4,5-trione and recovered starting materials. All products were characterized using FT-IR, NMR, and elemental analysis. The structure of 1-methylimidazolidine-2,4,5-trione and 1,3-dimethylimidazolidine-2,4,5-trione were further confirmed by single crystal X-ray diffraction.
Melt-cast explosive material
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Page/Page column 7, (2008/06/13)
1-Methyl-2,4,5-Trinitroimidazole is synthesized starting from 4-nitroimidazole using stepwise nitration method and further methylation using Dimethylsulphate. It is relatively insensitive to impact and its thermal stability is excellent. The calculated detonation properties indicate that its performance is about 30% better than TATB. It can be prepared easily, with reasonable yield, starting from commercially available Imidazole. Results from impact sensitivity, friction sensitivity, time-to-explosion temperature and vacuum stability tests indicate that it is less sensitive than both RDX and HMX. The good oxygen balance and measured heat of formation data of this material indicate that its propellant performance should be good.
Nitroimidazoles: Part XI - Some Halonitro- and Dinitroimidazoles
Sudarsanam, V.,Nagarajan, K.,George, T.,Shenoy, S. J.,Iyer, V. V.,Kaulgud, A. P.
, p. 1022 - 1026 (2007/10/02)
Methylation of 2-chloro-4-nitroimidazole (6), obtained from imidazole in four steps, either with dimethyl sulphate or with diazomethane affords a mixture of 2-chloro-1-methyl-5-nitroimidazole (10) and the 4-nitro-isomer (7).The corresponding dinitro compounds 11 and 8 are formed in the methylation of 2,4-dinitroimidazole (5), 8 being converted to 7 by the action of POCl3.Reaction of 10 with the sodium salt of N-methanesulphonyl-2-imidazolidinone provides the potent amoebicide, 1-methylsulphonyl-3-(1-methyl-5-nitroimidazol-2-yl)-2-imidazolidinone (2).The isomer 14 issynthesised from 7 in low yield.Ethylation of 5 leads to preponderant N-alkylation, providing a mixture of 1-ethyl dinitroimidazoles (9) and (12), but a small amount of N,C-diethyl derivative 15 is also obtained.The formation of 15 from 5 is rationalised.The diiodination product of imidazole is shown to be 4,5-diiodoimidazole (19), nitric acid transforming it to 4-iodo-5-nitroimidazole (20).Methylation of 20 affords a mixture of isomeric 1-methyliodonitro derivatives (21) and (22).The structures of 21 and 22 are established by 13C NMR data as well as by conversion into morpholine derivatives 26 and 24 respectively which also arise from 1-methylchloronitroimidazoles (25) and (23).A mechanism is proposed for the reported conversion of 5 into 4-chloro-5-nitroimidazole (32) in boiling 2-chloroethanol.
