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ortho group
相关语句
  邻位取代基
     Forming of intramolecular hydrogen bonding or ortho bezoquinone structure through resonance between the semiquinonoid free radical and ortho group can stabilize the semiquinonoid free radical.
     抗氧化剂半醌式自由基与邻位取代基形成分子内氢键或通过共振形成邻苯醌可使内能降低,半醌式自由基更稳定;
短句来源
  “ortho group”译为未确定词的双语例句
     The kinetics and mechanism of the oxidations of alcohols with a ortho group byditelluratocuprate( 111 ) and ditelluratoargentate( Ill ) in alkaline medium byspectrophotometric method were investigated .
     本文采用分光光度法研究了碱性介质中二(过碲酸)合银(Ⅲ)、二(过碲酸)合铜(Ⅲ)两种超常价态的配离子氧化邻位带有活性基团的醇类有机物的动力学及机理。
短句来源
     By oxidation of a series of alcohol, we found that thedifferent ortho group oxidized would effect the ability of the formation of the adductbetween the oxidant and the organic compound.
     通过研究氧化一系列的醇类发现,被氧化基团邻位的活性基团不同(-OH,-COOH,-CH_3COOH,-OCH_3,-OC_2H_5,-OC_4H_9),会直接影响配合物和有机物形成加合物(中间活化络合物)的能力,从而影响速控步各种动力学性质。
短句来源
     The kinetics and mechanism of oxidation of alcohols with an ortho group and a series of amino acids by dihydroxydiperiodatonickelate(Ⅳ) in alkaline medium through spectrophotometric method were investigated.
     本文采用分光光度法研究了碱性介质中二羟基二过碘酸合镍(Ⅳ)配离子氧化邻位带有活性基团的醇类和氨基酸的动力学及机理。
短句来源
     In addition, the different ortho group of oxidized group also affect the ability to the formation of the adduct between the active species and the organic compound, like the oxidation of some series of amino acids, the larger the spatial hindrance of ortho group is, the slower the reaction rate is, which further affect the various kinetic characterization.
     同时被氧化基团邻位的活性基团不同会直接影响配合物和有机物形成活化络合物中间体的能力,在氧化系列氨基酸(氨基乙酸、氨基丙酸、缬氨酸、亮氨酸和异亮氨酸)中,随着邻位基团的空间位阻加大,形成中间体的能力减弱,反应速度就减小,进而影响到各种动力学性质。
短句来源
  相似匹配句对
     Group C.
     实验动物随机分为3组,每组9只。
短句来源
     group.
     LPS+ICAM1单抗处理组;
短句来源
     Investigating ortho-effect
     探析邻位效应
短句来源
     Ortho-oriented Halogenaton of Benzaldehyde
     苯甲醛的邻位定向卤代
短句来源
     Synthesis And Application of Ortho-photororesist
     正性光致抗蚀剂的合成与应用
短句来源
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Abstract In the structural modification of the quinolone antibacterials,position-8 in the ring was one focus of attention.Some groups such as halogen,nitro or amino had been introduced in order to study the structure-activity relation-ship.The reported procedure for the preparetion of 8-nitro-substituted-quinolone derivatives were started from the commercially unavailable 2,4-dichloro-3-nitro-5-fluorobenzoic acid via 8-step reactions and involved several troublesome operations.In this paper,a new simple...

Abstract In the structural modification of the quinolone antibacterials,position-8 in the ring was one focus of attention.Some groups such as halogen,nitro or amino had been introduced in order to study the structure-activity relation-ship.The reported procedure for the preparetion of 8-nitro-substituted-quinolone derivatives were started from the commercially unavailable 2,4-dichloro-3-nitro-5-fluorobenzoic acid via 8-step reactions and involved several troublesome operations.In this paper,a new simple preparation of the title compounds was reported.Analyzing the Structure of ethyl 6-fluoro-7-Chloro-1,4-dihydro-4-line-3-carboxylate(1),it was assumed that the nitration might occur at position -8 in the ring,while position-2 and -5 were deactivated by the electronwithdrawal effect of the ortho-groups. Our experiments showed that 1 was difficult to be nitrated in the mixed acid at room temperature and was decomposed at higher temperature.The optimum reaction temperature was 50~60℃and fuming nitric acid was added portionwise.otherwise a lower yield was obtained.Compound 2 was unprecedented in the literature.Its elemental analysis was consistent with the formula C12H8ClFN2O5.In the 1HNMR spectrum(TFA as solvent) there were two signals for the aromatic protons:one was a single peak at 9.58ppm,belonging to H at position-2,another was a double peak(J=9.9Hz)at 8.71 ppm resulting from the coupling between F at position-6 and the orthohydrogen,indicating the presence of H at position-5.The result of nucleophilic substitution of 2 with piperazine implied the existence of nitro group at position -8 since in the reaction the leaving group was Cl rather than F.The 8-nitro-or 8-amino-Substituted-quinolone derivatives would be obtained from compound 2 by the adequate reactions such as N-alkylation,nucleophilic substitution and reduction.So the Preparation of 2 from 1 gave a new access to the structural modification of fluoroquinolone antibacterials.

8-硝基取代喹诺酮类化合物简便合成的新方法周伟澄,刘庆,徐震宇,张秀平(上海医药工业研究院,上海200437)在氟喹诺酮类抗菌药的结构改造中,其母环的8位是研究的焦点之一。曾在8位引入卤素、硝基和氨基等基团,以探索其构效关系。文献报道的8-硝基喹诺酮...

Chlorogenic acid, forsythiaside and other derivatives of cinnamic acid are active components of Chinese herbs. In this paper, their scavenging effects on HO· are studied by the o-phenathroline chemiluminescent system. The experimental results were elucidated by the quantum chemistry calculation (3-21G, B3LYP). The relationships of structure-activity indicate that ΔE value, the difference of the energy between the mother molecule and its free radical, is a better parameter to represent the activity of phenolic...

Chlorogenic acid, forsythiaside and other derivatives of cinnamic acid are active components of Chinese herbs. In this paper, their scavenging effects on HO· are studied by the o-phenathroline chemiluminescent system. The experimental results were elucidated by the quantum chemistry calculation (3-21G, B3LYP). The relationships of structure-activity indicate that ΔE value, the difference of the energy between the mother molecule and its free radical, is a better parameter to represent the activity of phenolic antioxidants to scavenge free radicals. Forming of intramolecular hydrogen bonding or ortho bezoquinone structure through resonance between the semiquinonoid free radical and ortho group can stabilize the semiquinonoid free radical. The semiquinonoid free radical can be further stabilized by the electron-providing substitutive group in the para position of the H-abstraction hydroxyl.

利用邻菲罗啉化学发光法研究了中草药有效成分氯原酸、连翘酯甙等肉桂酸类抗氧化剂对HO·的清除作用。量子化学计算[3-21G、B3LYP/6-31G(d)]对实验结果给予了合理的解释。 计算结果显示抗氧化剂形成半醌式自由基前后的能量之差(ΔE)能较好地衡量其活性的高低;抗氧化剂半醌式自由基与邻位取代基形成分子内氢键或通过共振形成邻苯醌可使内能降低,半醌式自由基更稳定;脱氢酚羟基的对位含有给电子取代基团时,可使半醌式自由基易形成并提高其稳定性。

 
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