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自由基反应的
相关语句
  free radical reactions
    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
    STUDIES OF THE INFLUENCES OF PROTECTOR DTT AND SENSITIZER MISO ON THE RADIATION-INDUCED BIOMOLECULAR FREE RADICAL REACTIONS BY THE SPIN TRAPPING ESR METHOD.
    自旋俘获ESR法研究防护剂DTT和敏化剂MISO对生物分子辐射自由基反应的影响
短句来源
    The Studies of Free Radical Reactions by Using Time-resolved FTIR Emission Spectroscopy
    时间分辨红外发射光谱法对自由基反应的研究
短句来源
    The reactions between l-acetylindole-2, 3-didone with phenols and piperonal are kind of free radical reactions.
    对1一乙酞基一2,3一叫噪二酮夺氢光还原反应机理的研究表明:1一乙酞基一2,3一叼}噪二酮与酚类化合物及含有活泼氢的胡椒醛在氖苯溶液中的光化学反应过程具有自由基反应的特点。
短句来源
  “自由基反应的”译为未确定词的双语例句
    Method of the Semiclassical Statistics for Unimolecular Reactions to form Two Free Radicals I. Decomposition of CH_4 to GH_3·and H·
    单分子分解成两个自由基反应的半经典统计方法——Ⅰ.关于CH_4分解成CH_3·和H·自由基的研究
短句来源
    Study on the Reaction of C_(60),with Radical (CH3)2CCN
    C_(60)与偶氮二异丁腈基自由基反应的ESR研究
短句来源
    Theoretical investigations are carried out on the reaction CH3SOCH3+XO(X=Cl,Br) by means of the density function theory method B3LYP with 6-311+G(d,p) basis set.
    采用密度泛函理论B3LYP方法,在6-311+G(d,p)基组水平上研究了二甲亚砜(DMSO)与XO(X=Cl,Br)自由基反应的微观动力学机理,并利用经过wigner校正的传统过渡态理论计算了标题反应在200~2000 K温度范围内的反应速率常数。
短句来源
    Study on the reactions of acetonitrile with methyl radicals by direct abintio dynamics
    乙腈与甲基自由基反应的直接动力学研究
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
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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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