共查询到20条相似文献,搜索用时 328 毫秒
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酰胺缩醛法合成N,N,N′┐三取代甲脒的研究张娟刘毅锋(西北大学应用化学研究所西安710069)脒类化合物用作杀螨、杀虫剂,除草剂,消炎剂等[1,2],也是合成氮杂环化合物的中间体[3]。有关脒的合成及应用研究的进展,我们已进行了较为详细的评述[4]... 相似文献
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本文研究了(N,N′—二乙基)偶氮二异丁脒盐酸盐引发下丙烯酰胺水溶液聚合的反应动力学。得出了聚合速率方程式为RP=KP[EAIBA]05[AM]。测定了聚合表观活化能。并研究了聚合条件对产物分子量及其分布的影响。利用该引发—聚合体系,获得了相对分子量上千万超高分子量聚丙烯酰胺。 相似文献
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用N,N-二甲基甲酰胺缩二甲醇[(CH3)2NCH(OCH3)2,1]和蝶呤(2-氨基-4- 羟基蝶啶)衍生物在极性有机溶剂中反应一般得到脒化产物:N^2-(N,N-二甲基氨 基亚甲基)-蝶呤衍生物,但是在1,4-二氧六环中进行以上反应时发现,N,N-二甲 基酰胺缩二甲醇(1)不仅是脒化试剂,而且也是蝶呤化合物的甲基化试剂,并且 也依据蝶呤的N^2-位的不同取代基进行选择性的N(3)-或O^4-甲基化反应。 相似文献
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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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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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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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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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