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硝基加氢
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  “硝基加氢”译为未确定词的双语例句
     In order to improve the reaction for preparation of N-(1-ethylpropyl)-3,4-dimethylaniline, one step synthesis reaction and reaction mechanism were proposed and 3,4-dimethylnitrobenzene was selected as the start material. Several factors such as hydrogenation catalyst, promotion acid catalyst and reaction temperature etc. were considerd and tested.
     以自制的Pd-Pt/C为加氢催化剂,有机酸为助催化剂,3,4-二甲基硝基苯和3-戊酮为原料,通过硝基加氢、酮胺加成、脱水与碳氮双键加氢一系列反应一步法合成了N-(1-乙基丙基)-3,4-二甲基苯胺。
短句来源
  相似匹配句对
     Catalytic Hydrogenation of o-Nitroanisole in Liquid Phase
     邻硝基苯甲醚液相加氢反应
短句来源
     Selective Catalytic Hydrogenation of 3-Nitro-4-methoxyacetanilide
     3-硝基-4-甲氧基乙酰苯胺的选择性催化加氢
短句来源
     The Hydrogenation of Two Tar from The Coal
     煤焦油的加氢反应性
短句来源
     Hydrogenation of Polymer Containing Polydiolefin Units
     不饱和聚合物的加氢
短句来源
     Nitro-cellulose wood coatings
     硝基木器漆
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In order to improve the reaction for preparation of N-(1-ethylpropyl)-3,4-dimethylaniline, one step synthesis reaction and reaction mechanism were proposed and 3,4-dimethylnitrobenzene was selected as the start material. Several factors such as hydrogenation catalyst, promotion acid catalyst and reaction temperature etc. were considerd and tested. The Pt-Pd/C bimetal hydrogenation catalyst was proved to be more efficient in this reaction than Pt/C catalyst. Middle acidity organic acid which has lower solubility...

In order to improve the reaction for preparation of N-(1-ethylpropyl)-3,4-dimethylaniline, one step synthesis reaction and reaction mechanism were proposed and 3,4-dimethylnitrobenzene was selected as the start material. Several factors such as hydrogenation catalyst, promotion acid catalyst and reaction temperature etc. were considerd and tested. The Pt-Pd/C bimetal hydrogenation catalyst was proved to be more efficient in this reaction than Pt/C catalyst. Middle acidity organic acid which has lower solubility in water can be selected as promotion catalyst. Much more intermediate compounds may exist when the reaction temperature is lower than 80℃, and more byproducts may be produced when temperature is higher than 120℃. Therefore the best reaction temperature was ranged from 80℃ to 120℃. At the suitable reaction conditions such as using Pt-Pd/C as hydrogenation catalyst; benzenesulfonic acid as promotion acid catalyst; reaction temperature: 100℃; hydrogen pressure: 1.2MPa; 3-pentanone: 3,4-dimethylnitrobenzene (molar ration)=2:1; 3,4-dimethylnitrobenzene:catalyst (weight ration)=100:1, the total yield reached to 98.6% and that in about 10% higher than ordinary reaction for preparation of N-(1-ethylpropyl)-3,4-dimethylaniline.

以自制的Pd-Pt/C为加氢催化剂,有机酸为助催化剂,3,4-二甲基硝基苯和3-戊酮为原料,通过硝基加氢、酮胺加成、脱水与碳氮双键加氢一系列反应一步法合成了N-(1-乙基丙基)-3,4-二甲基苯胺。考察了不同加氢催化剂、助催化剂和反应温度对该反应的影响;在较佳的反应工艺条件下,四步反应的总收率达98.6%,比文献值收率提高10%。

A new technology of synthesizing isooctyl para-dimethylaminobenzoate and the factors affecting the yield of product were studied.With p-nitrobenzoic acid and isooctanol as starting materials,isooctyl p-dimethylaminobenzoate was prepared in three steps:esterification,nitryl hydrogenation and N-alkylation.N-alkylation reaction was studied mainly,and the optimum reaction conditions are as follows:reaction temperature 90 ℃~100 ℃;reaction time 15 h;content of catalyst 10 %;molar ratio of para-aminobenzoate...

A new technology of synthesizing isooctyl para-dimethylaminobenzoate and the factors affecting the yield of product were studied.With p-nitrobenzoic acid and isooctanol as starting materials,isooctyl p-dimethylaminobenzoate was prepared in three steps:esterification,nitryl hydrogenation and N-alkylation.N-alkylation reaction was studied mainly,and the optimum reaction conditions are as follows:reaction temperature 90 ℃~100 ℃;reaction time 15 h;content of catalyst 10 %;molar ratio of para-aminobenzoate to formaldehyde 10∶22;the general yield of prduct is 847 %,furthermore,it is needless to use virulent sulfuric acid dimethyl ester.

提出了一种合成防晒剂对二甲氨基苯甲酸异辛酯的新工艺,即以对硝基苯甲酸和异辛醇为起始原料,经酯化、硝基加氢、N-烷基化合成对二甲氨基苯甲酸异辛酯。着重讨论了合成关键步骤:N-烷基化反应。找到了较佳的反应条件:反应温度90℃~100℃,反应压力1 5MPa~2 0MPa,反应时间15h,骨架镍用量为对氨基苯甲酸异辛酯质量的10%,对氨基苯甲酸异辛酯与甲醛摩尔比1 0∶2 2。与目前文献介绍的合成工艺相比,此工艺将产物收率提高了近50%,收率达84 7%,同时还避免了使用剧毒原料硫酸二甲酯。

>=Amination at position 2,6 of the raw material 2,6-dichloro-3-nitropyridine, respectively by ammonia and 4-fluorobenzylamine, followed by hydrogenation and acylation at position 3 gave Flupirtine, whose maleate is an analgesic drug without dependence. Various crystal modifications formed were analyzed by DSC and examined by X-ray diffractometry. It is shown how to obtain the modification wanted by DSC monitoring and the little difference in anti-free-radicals between the two modification A,B.

氟吡汀马来酸盐是以2,6-二氯-3-硝基吡啶为原料,分别与氨,对氟苄胺在2,6位发生取代,硝基的加氢还原,接着与氯甲酸乙酯发生酰化反应,再与马来酸成盐来制备。总收率76.5%, 晶型为B型,在异丙醇溶剂20C,180rm搅拌条件下,分别在1h、1.5h、2.0h、3.0h用小角X衍射仪检测其晶型为11%A,22%A,42%A,85%A的混合晶型,对其不同混合晶型的DSC(差热分析) 曲线进行了研究,得出A,B两种晶型的特征峰的变化规律,并测定并比较了两种晶型抗自由基活性。

 
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