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A new diamide N,N,N′,N′-tetrahexylmalonamide (THMA) was synthesized, characterized and used in the extraction of U(VI) from
nitric acid solutions. N,N,N′,N′-tetrabutylmalonamide (TBMA) was also studied to test the steric hindrance. Factors affecting
this extraction system, the concentration of the extractant, aqueous nitric acid and NaNO3 and the temperature were investigated. The IR spectral study was also made of the extracted species. 相似文献
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Conclusions Syntheses are reported for asymmetric N,N-disubstituted N.N-dinitromethylenediamines by the Mannich reaction from N-nitroalkylamines, formaldehyde, and 2-fluoro-2,2-dinitro-ethylamine in methanol or ethanol.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 3, pp. 721–723, March, 1989. 相似文献
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O. V. Anikin L. G. Gareeva I. E. Chlenov V. A. Tartakovskii Yu. T. Struchkov V. S. Kuz'min Yu. N. Burtsev 《Russian Chemical Bulletin》1989,38(8):1659-1663
N,N-dinitrosulfodiamides are formed in the nitration of sulfodiamides with concentrated nitric acid or nitronium borofluoride, and also on substitutional nitration of the corresponding N,N-di-tert.-butyl derivatives with those reagents. Sulfuryl chloride reacts with the disodium salt of ethylene N,N-dinitramine to produce 2,5-dinitro-1,2,5-thiadiazolidine-1,1-dioxide. The corresponding N-nitrosulfamides are formed when nitramine salts react with methane sulfochloride.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 8, pp. 1812–1815, August, 1989. 相似文献
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A. V. Fokin V. P. Stolyarov V. S. Galakhov A. T. Uzun 《Russian Chemical Bulletin》1973,22(9):2116-2117
Conclusions The syn-isomers of N,N,N-trifluorobutyramidine and N,N,N-trifluoromonochloroacetamidine are isomerized in the presence of HCl to the anti-form. The isomerization of the syn-isomer of N,N,N-trifluoromonochloroacetamidine also proceeds in the presence of ethanol.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 9, pp. 2159–2160, September, 1973. 相似文献
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M. Yu. Alyapyshev V. A. Babain N. G. Antonov I. V. Smirnov 《Russian Journal of Applied Chemistry》2006,79(11):1808-1815
Extraction of americium and europium from perchloric acid solutions with pyridine-2,6-dicarboxamides was studied. The solvate numbers and Am/Eu separation factors were determined. 相似文献
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Navjeet Kaur 《合成通讯》2013,43(15):1711-1742
The development of new strategies for the synthesis of small-sized heterocycles has remained a highly attractive but challenging proposition. An overview of the application of microwave irradiation to the synthesis of five-membered heterocyclic compounds containing three and four nitrogen atoms is presented, focusing on the developments in the past 5–10 years. This contribution covers the literature concerning the total synthesis of N,N,N- and N,N,N,N-heterocycles. The literature data are summarized based on the size and type of cycles. 相似文献
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The extraction of adenosine phosphates with hydrophobic cyclic diammonium or alkyl diammonium salts is described. The selectivity of these compounds is governed by two factors, the length of the spacer arm between the two ammonium nitrogens and the pH of the system. The cyclic compound exhibits less selectivity than the similar noncyclic alkyl compounds. It is shown that several of the compounds are fairly selective for adenosine 5′-triphosphate (ATP). The best of these, N,N,N′-tetramethyl-N,N′-dioctadecyldiammoniumethane, is tested for assay of ATP in spiked urines. 相似文献
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2,3—二甲基吡嗪合成工艺的改进 总被引:2,自引:0,他引:2
报道了以丁二酮和乙二胺为原料,对液相合成2,3-二甲基吡嗪的方法进行了改进,考察了反应温度,溶剂用量和脱氢剂等对反应影响,确定了合成2,3-二甲基吡嗪的优化条件为,丁二酮:乙二胺(摩尔比)=1:1.05;丁二酮:溶剂无水乙醇(体积比)=1:10,缩合反应温度:-5℃,时间:1h,脱氢剂:DHKM-12,脱氢温度:80~85℃,时间:1h2,3-二甲基吡嗪的产率按投料丁二酮设计达65%。 相似文献
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This reagent forms a sparingly soluble precipitate, [C18H40O4N2H2]3[P(Mo3O10)4]2 in presence of phosphate and molybdate in hydrochloric acid solution. The precipitate is well suitable for a gravimetric determination of phosphorus (factor 0.013190). Standard deviation was ± 0.3 mg for 93.94 mg and ± 0.6 mg for 1174,2 mg of precipitate. Fe, Mn, Cr, Co and Ni do not interfere up to a 500-fold excess. 相似文献