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自由基反应的
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  free radical reactions
     Moreover, the effect of Hg2+ on free radical reactions induced by CCl4 as an applied case of the method was studied, and the result indicated that Hg2+ and CCl4 had stimulative effect on each other.
     同时以Hg2+对CCl4体外引发小鼠肝匀浆自由基反应的影响为应用实例进行了研究,结果表明,Hg2+与CCl4的毒性有协同作用.
短句来源
     STUDIES OF FREE RADICAL REACTIONS THE REACTION OF GRIGNARD REAGENTS WITH 2-BROMOOCTANE IN THE PRESENCE OF COBALTOUS BROMIDE
     自由基反应的研究——Grignard试剂与2-溴辛烷在二溴化钴存在下的反应
短句来源
     Influence of indomethacin on free radical reactions in brain tissues of rabbits with brain injury
     消炎痛对兔脑外伤后脑组织氧自由基反应的影响
短句来源
     Objective To investigate the changes of plasma free radical reactions in patients with SIRS and to explore the relation between plasma free radical reactions and severity of SIRS.
     目的 了解全身炎症反应综合征 (SIRS)病人血浆自由基反应的变化情况 ,以及自由基反应与SIRS程度的关系。
短句来源
     :In this paper, through measuring the contents of MDA of reactive liquid consisting of different dose CCl4 and mice liver homogenate, a simple experimental method for inspecting free radical reactions induced by CCl4 in vitro was established, and the results of the experiments were checked.
     通过对不同剂量CCl4与小鼠肝匀浆温育反应液中丙二醛(MDA)含量的测定,确立了CCl4体外引发自由基反应的简易实验方法,并对实验方法进行了考核评定.
短句来源
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  “自由基反应的”译为未确定词的双语例句
     Theoretical study on the reaction of CH_3SOCH_3 with XO(X=Cl,Br) radical
     CH_3SOCH_3与XO(X=Cl,Br)自由基反应的理论研究
短句来源
     Theoretical Studies on the Mechanism for the Reaction of HNCS with CX (X=H, F, Cl) Radical
     HNCS与CX(X=H,F,Cl)自由基反应的理论研究
短句来源
     THEORETICAL STUDIES ON REACTION OF H WITH CF_3O_2 RADICAL
     H与CF_3O_2自由基反应的理论研究
短句来源
     The mechanism for the biradical reaction beween HCCO and CH(~ 2Π) was investigated theoretically by using the DFT-UB3LYP/6-311+G~** and the high-level electron-correlation UQCISD(T)/{6-311+G~** } at single-point.
     用量子化学密度泛函理论的UB3LYP/6-311+G方法和高级电子相关的UQCISD(T)/6-311+G方法研究了HCCO与CH(2Π)自由基反应的微观机理.
短句来源
     The Present Studies on the Reaction of CH_3SH with Simple Radicals
     CH_3SH与简单自由基反应的研究现状
短句来源
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  相似匹配句对
     (b) the semiquinone anion-radicals are direct products of the reaction of the substrates;
     2)半醌自由基阴离子是反应的产物;
短句来源
     Study on the radical homopolymerization of N-L-ananylmaleimide
     N-L-丙胺酰马来酰亚胺自由基均聚合反应的研究
短句来源
     FREE RADICAL'S SCAVENGING
     自由基的清除
短句来源
     KINESTIC ABILITY AND FREE RADICAL
     运动能力与自由基
短句来源
     Stereochemistry about the Elimination Reaction
     消除反应的立体化学
短句来源
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  free radical reactions
The effects of lipoic acid on intensity of free radical reactions, citrate content, and aconitate hydratase during myocardial ischemia have been investigated.
      
This may result from multifunctional activity of alcohol metabolizing enzymes and their involvement in many metabolic and free radical reactions in the body.
      
Antioxidant activity of free radical reactions inhibitors, applied to the dressing material for wound healing
      
Free radical reactions of pyridoxal (vitamin B6): a pulse radiolysis study
      
Propofol could be beneficial as an anesthetic in patients presenting pathologies associated with free radical reactions during CPB.
      
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When the direct addition of thiophenol to phenylacetylene, p-bromophenylacetylene, p-nitrophenylacetylene, and propiolic acid was conducted at room temperature, the corresponding 1:1 adducts of trans-configuration were obtained, which were trans-β-phenylthiostyrene (Ia), trans-β-phenylthio-p-bromostyrene (Ⅱa), and trans-β-phenylthioacrylic acid (Ⅳa) respectively. The yields of these adducts decreased in the following order: Ⅰa>Ⅱa>Ⅲa>Ⅳa.

苯硫酚与苯乙炔、对溴苯乙炔、对硝基苯乙炔及丙炔酸在室温进行直接加成时,生成相应的1:1加成物,其主体构型均属反式,分别为反-β-苯硫基苯乙烯(Ⅰa),反-β-苯硫基对溴苯乙烯(Ⅱa),反-β-苯硫基对硝基苯乙烯(Ⅲa)及反-β-苯硫基丙烯酸(Ⅳa)。加成物的得率按以下顺序而递減:Ⅰa>Ⅱa>Ⅲa>Ⅳa。在低温(-45~-35°)苯硫酚与四种炔烃在溶液中反应时,除对硝基苯乙炔不起反应外,其它三种炔化合物均给出全部或绝大部分顺式构型产物(反式加成),分别为顺-β-苯硫基苯乙烯(Ⅰb,100%),顺-β-苯硫基对溴苯乙烯(Ⅱb,75%)及顺-β-苯硫基丙烯酸(Ⅳb,80%)。所有顺式构型产物在反应条件下都稳定,只是在加热到160°以上时才转化为反式构型产物。苯硫酚对炔烃的直接加成为一自由基反应,所观察到的立体化学结果被解释为加成反应中形成的中间体自由基(Ⅴ),由于R(苯基或羧基)与处于顺式位置的C_6H_5S基的空间位阻,在与苯硫酚进行链转移之前发生异构化所致。因为Ⅴ的异构化为Ⅵ需要一定的活化能,故在低温下的加成全部或绝大部分按反式加成进行,在温度升高时全部转为顺式加成。苯硫酚与对硝基苯乙炔在无水乙醚中在—60°形...

苯硫酚与苯乙炔、对溴苯乙炔、对硝基苯乙炔及丙炔酸在室温进行直接加成时,生成相应的1:1加成物,其主体构型均属反式,分别为反-β-苯硫基苯乙烯(Ⅰa),反-β-苯硫基对溴苯乙烯(Ⅱa),反-β-苯硫基对硝基苯乙烯(Ⅲa)及反-β-苯硫基丙烯酸(Ⅳa)。加成物的得率按以下顺序而递減:Ⅰa>Ⅱa>Ⅲa>Ⅳa。在低温(-45~-35°)苯硫酚与四种炔烃在溶液中反应时,除对硝基苯乙炔不起反应外,其它三种炔化合物均给出全部或绝大部分顺式构型产物(反式加成),分别为顺-β-苯硫基苯乙烯(Ⅰb,100%),顺-β-苯硫基对溴苯乙烯(Ⅱb,75%)及顺-β-苯硫基丙烯酸(Ⅳb,80%)。所有顺式构型产物在反应条件下都稳定,只是在加热到160°以上时才转化为反式构型产物。苯硫酚对炔烃的直接加成为一自由基反应,所观察到的立体化学结果被解释为加成反应中形成的中间体自由基(Ⅴ),由于R(苯基或羧基)与处于顺式位置的C_6H_5S基的空间位阻,在与苯硫酚进行链转移之前发生异构化所致。因为Ⅴ的异构化为Ⅵ需要一定的活化能,故在低温下的加成全部或绝大部分按反式加成进行,在温度升高时全部转为顺式加成。苯硫酚与对硝基苯乙炔在无水乙醚中在—60°形成一深紫色溶液,两小时后颜色逐渐变淡,这似乎表明有自由基的形成。苯硫酚与四种炔化合物在乙氧基负离子催化下进行加成时,得到全部为反式加成的产物,分别为Ⅰb,Ⅱb,顺-β-苯硫基对硝基苯乙烯(Ⅲb)及Ⅳb。

The free radical addition of propane-2-thiol、n-hexanethiol、n-bu-tanethiol, n-propanethiol, 3-phenylpropanethiol, 2-phenylethanethiol,n-propyl 2-thiolacetate, and thiophenol to 3-phenylpropene-1 has beeninvestigated, and the relationship between structure and reactivity discussed.With the first aforementioned seven thiols of which the inductive effectplayed a dominant role, a positive"s"type curve was obtained ?hen thepercentage conversion of 3-phenylpropene-1 was plotted against the indu-ctiveindices (Ⅰ value)...

The free radical addition of propane-2-thiol、n-hexanethiol、n-bu-tanethiol, n-propanethiol, 3-phenylpropanethiol, 2-phenylethanethiol,n-propyl 2-thiolacetate, and thiophenol to 3-phenylpropene-1 has beeninvestigated, and the relationship between structure and reactivity discussed.With the first aforementioned seven thiols of which the inductive effectplayed a dominant role, a positive"s"type curve was obtained ?hen thepercentage conversion of 3-phenylpropene-1 was plotted against the indu-ctiveindices (Ⅰ value) or Taft σ~* constants of the R groups in the re-spective RS. radicals, indicating that these sulfur-centered free radi-cals have electrophilic properties. In the case of phenylthio free radicalformed from thiophenol in which conjugative effect would be predomi-nating, however,its reactivity fell into a different group with the otherthiols. The structure of the addition products was confirmed through i.r,nmr., and by comparison with corresponding synthetic samples to beterminal 1:1 adducts. In the addition of thiophenol to 3-phenylpropene-1 there was observ-ed,besides the major 1:1 terminal addition product, another productwhich might be that formed through the 1,2-migration of the phenyl groupin the free radical intermediate. This is under further investigation.

研究了异—丙硫醇、正—己硫醇、正—丁硫醇、正—丙硫醇、3—苯基丙硫醇—[1]、苄硫醇、硫醇乙酸正丙酯和苯硫酚对3—苯基丙烯—[1]的自由基加成反应,讨论了硫醇的结构与反应性能间的关系。受诱导放应支配的硫中心自由基(RS.)加成时,3—苯基丙烯—[1]的百分转化率与RS.中取代基(R)的诱导放应指数(I值)和Taft基团常数(σ~*值)间均有“正S型”曲线关系,因此,硫中心自由基具有亲电子性能。但是受共轭效应支配的苯硫基自由基的反应性能与其他硫自由基不在同一系列。加成产物的结构用与对照物进行比较或以红外光谱,核磁共振谱分析等方法鉴定表明硫醇对3—苯茎丙烯—[1]加成时皆为1:1未端加成物。 苯硫酚与3—苯基丙烯—[1]加成时反应产物中除主要的1:1未端加成物外,可能还存在着少量由于自由基中间体发生苯基1.2—迁移所形成的产物或按Markownikoff规则加成的产物。

Aryl diazonium salts react with a mixture of mercuric chloride,diethyl phosphite,cupric chloride and acetone at room temperature to give corresponding arylmercuricchlorides in high yields without isolation of the diazonium mercurichlorides.Thirtyone arylmercuric chlorides,including five new compounds,were prepared by thismethod.Preliminary investigation indicates that the reaction probably proceeds by freeradical mechanism.

芳香族重氮盐在室温下与氯化汞、亚磷酸二乙酯、氯化铜和丙酮所配成的混合物直接作用,放出氮气生成相应的氯化芳基汞,产率良好,不需要分离重氮盐和氯化汞所生成的复盐.用这个方法合成了31种氯化芳基汞,其中包括五种新化合物.对这个反应的历程进行了初步探讨,它可能是自由基反应.

 
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