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catalytic
相关语句
  催化
     Study on Functionalization of Saturated Carbon by Catalytic Oxidation
     催化氧化饱和碳原子功能化研究
短句来源
     Synthesis,Characterization and Catalytic Properties in Selective Oxidation of Titanosililcates
     钛基催化材料的合成、表征和选择氧化性能研究
短句来源
     A Study on Hydrogen Transfer Reaction over Catalytic Materials Used in FCC Process
     FCC催化材料上的氢转移反应研究
短句来源
     Synthesis, Characterization and Catalytic Carbonylation Reactions of Phosphine Liands Containing Phosphonate and Their Palladium Complexes
     含膦酸根等水溶性膦配体及其钯配合物的合成、表征和催化羰基化反应
短句来源
     Catalytic Synthesis of Cyclic Carbonates under Supercritical Conditions
     超临界条件下环状碳酸酯的催化合成
短句来源
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  催化的
     The regulating effect of water on butadiene polymerization in the catalytic systems of Ni(naph) 2 Al(i Bu) 3 (n C 8H 17 OH+BF 3·OEt 2) and Ni(naph) 2 Al(i Bu) 3 BF 3·OEt 2 were studied and compared.
     研究了Ni(naph)2-Al(i-Bu)3-(n-C8H17OH-BF3OEt2)和Ni(naph)2-Al(i-Bu)3-BF3OEt2两种体系催化的丁二烯聚合中微量水的作用规律,测定了这些体系的动力学参数。
短句来源
     The transesterification of CH3OCOCH2CH2SnCl3 ? L with alcohol was studied, and the intramolecular Lewis acid catalytic mechanism was suggested.
     研究了CH_3OCOCH_2CH_2SnCl_3·L和醇的酯交换反应,提出了分子内Lewis酸催化的反应机理.
短句来源
     CATALYTIC ESTER INTERCHANGE OF 1,1′-BISNAPHTHOL-4,4′-DIACETATE AND DI(2-ETHYLHEXYL)CARBONATE
     金属化合物催化的1,1′-联二萘酚-4,4′-二乙酸酯和二(2-乙基己醇)碳酸酯的酯交换
短句来源
     The reaction between H2O2 and RRB (Reduced Rhodamine B) in HAc medium can be catalyzed by Fe3+, and the catalytic activity of Fe3+ can be diminished by F-.
     实验发现,在HAc介质中,痕量F~-对Fe~(3+)催化的还原型罗丹明B(RRB)被H_2O_2氧化生成红色产物的反应,有一定的阻化作用。
短句来源
     New Catalytic Pathway of Cytochrome P450 Enzymes
     细胞色素P450酶系循环催化的新途径
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  “catalytic”译为未确定词的双语例句
     Catalytic Properties of TiO_2-based and Ce_xTi_(1-x)O_2-based Catalysts in NO+CO Reaction
     负载型TiO_2及Ce_xTi_(1-x)O_2催化剂对NO+CO反应的催化作用
短句来源
     Study of the Direct Catalytic Amination and Hydroxylation of Benzene
     苯在催化剂作用下直接氨基化/羟基化研究
短句来源
     Preparation, Characterization of Ag/TS-1 Catalyst and Its Catalytic Properties on the Gas-Phase Epoxidation of Propylene
     Ag/TS-1催化剂的制备、表征及其丙烯气相环氧化性能的研究
短句来源
     Oxidation of Catalytic Oxidizing Non-biodegradable Organic Wastewater in Heterogeneous UV/Fenton Process
     非均相UV/Fenton处理难降解有机废水研究
短句来源
     Process Analysis and Simulation for the Catalytic Coupling Reaction of Carbon Monoxide to Diethyl Oxalate
     CO偶联合成草酸二乙酯反应体系的过程分析和模拟
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  catalytic
Catalytic Synthesis of n-Butyraldehyde 1,2-propanediol Acetal over H4SiW12O40-PAn
      
But when it was irradiated under UV illumination or solar irradiation for some time, the catalyst could be reused without loss of catalytic activity.
      
Its catalytic performance was evaluated by liquid-phase hydrogenation of chloronitrobenzene (CNB).
      
The results showed that the catalyst had higher catalytic performance than common hydrogenation catalysts.
      
X-ray diffraction and selected area electron diffraction analysis showed that Pt-Sn-B/CNTs had an amorphous alloy structure that can improve catalytic performance.
      
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The anhydro ring in a-methyl 2:3-anhydro-4:6-benzylidene-D-allopyranosidehas been opened by the action of sodium benzylate to give 53% yield ofα-methyl 2-benzyl-4:6-benzylidene-D-altropyranoside and 9% of a-methyl 3-benzyl-4:6-benzylidene-D-glucopyranoside.After the removal of the benzy-lidene residue by acid hydrolysis,the position of attachment of the benzylgroup is determined by periodate oxidation.Catalytic hydrogenolysis of thebenzyl group gives the known α-methyl D-altroside and a-methyl D-glucosiderespectively...

The anhydro ring in a-methyl 2:3-anhydro-4:6-benzylidene-D-allopyranosidehas been opened by the action of sodium benzylate to give 53% yield ofα-methyl 2-benzyl-4:6-benzylidene-D-altropyranoside and 9% of a-methyl 3-benzyl-4:6-benzylidene-D-glucopyranoside.After the removal of the benzy-lidene residue by acid hydrolysis,the position of attachment of the benzylgroup is determined by periodate oxidation.Catalytic hydrogenolysis of thebenzyl group gives the known α-methyl D-altroside and a-methyl D-glucosiderespectively and their constitutions are thus proved.While an ethylene oxide ring in a sugar molecule can be opened by alkaline reagents,such as sodium hydroxide,sodium methoxide,ammonia,etc,the use of sodium benzylate has the advantage that one of the hydroxylgroups is protected after the scission by the benzyl group which can in turnbe removed by catalytic hydrogenation.

应用苯甲醇钠可以裂解α-甲基2∶3-内醚-4∶6-苯亚甲基-D-同侧醣氧六圜配醣物的醚环,生成53%的α-甲基2-苯甲基-4∶6-苯亚甲基-D-2-异侧醣氧六圜配醣物及9%的α-甲基3-苯甲基-4∶6-苯亚甲基-D-葡萄糖氧六圜配醣物。此两化合物的结构,应用水解除去苯亚甲基及接触氢解除去苯甲基后,证明是已知的α-甲基 D-2-异侧醣氧六圜配醣物,及α-甲基 D-葡萄糖氧六圜配醣物;苯甲基在醣分子中的衔接位置,则应用高碘酸钠氧化测定。

Desdimethylaminoaureomycin (Ⅳ) and desdimethylaminodesoxyaureomycin (Ⅴ), when subjected to catalytic hydrogenation, yield deschlorodesdimethylaminoaureomycin (Ⅶ) and deschlorodesdimethylaminodesoxyaureomycin (Ⅷ) respectively. On warming with methanolic hydrogen chloride, Ⅶ and Ⅷ give their corresponding anhydro-compounds: deschlorodesdimethylaminoanhydroaureomycin (Ⅹ) and deschlorodesdimethylaminodesoxy- anhydroaureomycin (Ⅺ). On catalytic hydrogenation, anhydroaureomycin (Ⅵ) is converted into deschloroanhydro-...

Desdimethylaminoaureomycin (Ⅳ) and desdimethylaminodesoxyaureomycin (Ⅴ), when subjected to catalytic hydrogenation, yield deschlorodesdimethylaminoaureomycin (Ⅶ) and deschlorodesdimethylaminodesoxyaureomycin (Ⅷ) respectively. On warming with methanolic hydrogen chloride, Ⅶ and Ⅷ give their corresponding anhydro-compounds: deschlorodesdimethylaminoanhydroaureomycin (Ⅹ) and deschlorodesdimethylaminodesoxy- anhydroaureomycin (Ⅺ). On catalytic hydrogenation, anhydroaureomycin (Ⅵ) is converted into deschloroanhydro- aureomycin (Ⅳ), which, on further hydrogenation with zinc-acetic acid, produces a mixture of Ⅹ and Ⅺ. A comparison of the ultra-violet absorption spectra of Ⅶ, Ⅷ, Ⅸ, Ⅹ with the cor- responding degradation products of terramycin, Ⅻ, (XIII), (XIV), (XV), provides further evidence for the similarity of the structures between aureomycin and terramycin.

脫二甲胺金黴素(IV),脫二甲胺脫羥金黴素(V)分别予以接觸氫化,產生脫氯脫二甲胺金黴素(VII)及脫氯脫二甲胺脫羥金黴素(VIII)。這兩種產物再分別以甲醇鹽酸處理,得到它們相當的脫水化合物:脫氯脫二甲胺脫水金黴素(X)及脫氯脫二甲胺脫羥脫水金黴素(XI)。脫水金黴素(VI)經接觸氫化。產生脫氯脫水金黴素(IX)。後者用鋅粉醋酸氫解,亦得到Ⅹ與Ⅺ。

The synthesis of dl-threo-3-chloro-3-phenyl-2-aminopropanol hydrochloride (Ⅳ),a usefulintermediate for the preparation of racemic chloramphenicol~[4] ,has been achieved by treating1-phenyl-2-amino-3-ethoxypropanol hydrochloride (Ⅴ),m.p.119-120°,with concentrated hydro-chloric acid in sealed tube; the ethoxy group being converted to hydroxyl,and the replacementof secondary hydroxyl by chlorine having also taken place.The compound V was in turnprepared by a 3-step synthesis starting with ethyl α-benzoyl-β-ethoxyacrylate...

The synthesis of dl-threo-3-chloro-3-phenyl-2-aminopropanol hydrochloride (Ⅳ),a usefulintermediate for the preparation of racemic chloramphenicol~[4] ,has been achieved by treating1-phenyl-2-amino-3-ethoxypropanol hydrochloride (Ⅴ),m.p.119-120°,with concentrated hydro-chloric acid in sealed tube; the ethoxy group being converted to hydroxyl,and the replacementof secondary hydroxyl by chlorine having also taken place.The compound V was in turnprepared by a 3-step synthesis starting with ethyl α-benzoyl-β-ethoxyacrylate (Ⅵ).The latterwas subjected to catalytic hydrogenation in the presence of Raney nickel with simultaneousreduction of the double bond and the carbonyl group to form ethyl α-ethoxymethyl-β-hydroxy-β-phenylpropionate (Ⅶ),b.p.145-148°/2 mm.The second step was to convert the ester byusual way to its amide (Ⅷ),m.p.128. 5-129°,from which the compound (Ⅴ),(hydro-bromide:m.p.129°,picrate:m.p.163°) was obtained by Hofmann reaction.Ikuma~[3] found that either threo-or erythro-1-phenyl-2-amino-1,3-propanediol (Ⅲ)gavethe same dl-threo (Ⅳ) on treatment with thionyl chloride,so by analogy no conclusion could bedrawn as to the configuration of the compounds Ⅴ,Ⅶ and Ⅷ,although the dl-threo-Ⅳactually resulted.The preparation of a homolog of Ⅶ,methyl α-methoxymethyl-β-hydroxy-β-phenyl-propionate (Ⅹ),b.p.146-149°/1. 5-2 mm,was also attempted.The condensation of benzal-dehyde with α-bromo-β-methoxypropionate (Ⅸ) by Reformatsky reaction led to the desired pro-duct but with extremely poor yield.The experiment,however,showed that the Reformatskyreaction is possible to take place with a compound such as Ⅸ containing a methoxy groupin the β-position of the α-bromoester.The present work also dealt with the condensation of a β-ketoamide with formaldehyde.Our experiments indicated that the reaction of benzoylacetamide or p-nitrobenzoylacetamidewith this reagent in the presence of potassium or sodium acetate led to the formation of aproduct involving the condensation of two molecules of the corresponding amide with onemolecule of formaldehyde to form αα′-dibenzoylglutaramide (ⅩⅤ),m.p.197-198°(dec.),orαα′-di-p-nitrobenzoylglutaramide (ⅩⅥ),m.p.193-194°(dec.).The structure of ⅩⅤ was con-firmed by hydrolysis to 1,3-dibenzoylpropane (ⅩⅦ),which gave no melting point depressionwith authentic sample.The condensation of ethyl p-nitrobenzoylacetate with an excess of formaldehyde gave rise toethyl αα′-dihydroxymethyl-p-nitrobenzoylacetate (ⅩⅧ),m.p.125-126°.

1. 本文叙述了从α-苯甲醯-β-乙氧基丙烯酸乙酯开始经过四个步骤合成了制备氯霉素的有用中间体--dl-threo-3-氯代-3-苯基-2-氨基丙醇盐酸盐(Ⅳ)。2. 用 Reformatsky 反应合成了α-甲氧甲基-β-羟基-β-苯基丙酸甲酯(Ⅹ),虽然产量甚小,但说明了β位置含有甲氧基的α溴酯化合物可以应用于 Reformatsky 反应,而所得的产物为相应的β羟基酸酯而非不饱和酸酯。3. 进行了β羰基醯胺与甲醛的缩合,结果所得者为二分子β羰基醯胺与一分子甲醛缩合成戊二酸醯胺衍生物,而未取得羟甲基化合物。 4. 对硝基苯甲醯乙酸乙酯与过量的甲醛进行缩合,结果获得双羟甲基化合物,αα′-双-羟甲基-对硝基苯甲醯乙酸乙酯(ⅩⅧ)。

 
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