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二取代苯    
相关语句
  disubstituted benzene
    Studies on the Performance and Applications of Chloropropyl Bonded Silica I. Separation of Disubstituted Benzene Isomers and Prostaglandin Epimers
    氯丙基键合硅胶固定相色谱性能与应用 I.二取代苯及前列腺素差向异构体的分离
短句来源
    The azacrown ether bonded stationary phase to complexation of metal ion could exhibit various chromatographic properties,dipolar, hydrogen bond,electrostatic and hydrophobic interactions contribute in a certain sense to chromatographic separation,so that the separation selectivity and analytical speed for polar disubstituted benzene derivatives are superior to reversed-phase HPLC with ODS stationary phase.
    这种键合相通过对金属离子的络合,显示多种色谱分离机理,对极性二取代苯异构体分离选择性、分析速度均优于对比的C18键合固定相反相色谱.
短句来源
    A β cyclodextrin derivative, heptakis(2,6 di O pentyl 3 O benzyl) β CD, was synthesized and used as GC stationary phase. The chromatographic results show that the CDs is a good GC stationary phase with a good film forming property, moderate polarity and good separation ability to disubstituted benzene isomers such as cresols and xylene isomers.
    合成了一种苄基取代的环糊精衍生物 2 ,6-二 -O-戊基 -3-O-苄基 -β-CD,研究了其气相色谱分离性能 ,发现此固定相涂渍性好 ,极性适中 ,是一种良好的气相色谱固定相 ,对甲酚、二甲苯等难分离的二取代苯的位置异构体具有良好的分离能力 .
短句来源
    Geometrical optimization and electrostatic potential calculations have been performed at HF/6 31G level for 92 disubstituted benzene molecules.
    对含有常见取代基的92个二取代苯化合物进行了结构优化和静电势及其导出参数的计算,运用多元线性回归方法对化合物的疏水常数与分子的结构参数进行了关联.
短句来源
    It exhibited separation abilities to disubstituted benzene isomers and some chiral solutes.
    结果表明其对一些二取代苯的位置异构体及一些光学异构体具有分离能力 ,是一种良好的毛细管气相色谱固定相 .
短句来源
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  disubstituted benzenes
    The para—D,A—disubstituted benzenes and the 1—D,2,4—A,A trisubstituted benzenes possess optimal NLO responses.
    D,A对位二取代苯和1—D,2.4—A,A三取代苯具有较高的非线性光学效应,苯衍生物中取代基数目为3时分子具有最佳的非线性光学效应.
短句来源
    A QSPR Study on n-Octanol/Water Partition Coefficient of Disubstituted Benzenes:Application of Theoretical Descriptors Derived from Electrostatic Potentials
    结合三维静电势参数研究二取代苯的定量结构-疏水性关系
短句来源
    The chromatographic performance of CBS was studied by using PAHs, allkylbenzene and disubstituted benzenes as solutes and compared with mat of CPS and ODS; and the retention mechanism, column efficiency and peak symmetry were also studied.
    以苯的同系物、PAHs和二取代苯位置异构体为溶质考察固定相的色谱性能,与间隔基氯丙基柱及ODS进行对比研究,探讨固定相的保留机理,并考察其柱效与色谱峰对称性。
短句来源
    Good selectivity, symmetry peak and high column efficiency were obtained for disubstituted benzenes particularly aniline compounds, which make up the disadvantage of ODS.
    对二取代苯位置异构体尤其是碱性胺类溶质有良好的分离选择性,峰形对称,柱效高;
短句来源
    This paper reports the complexing capacities for metal ions and chromatographic performances of 3-(aza-18-C6) propyl bonded stationary phase, which were prepared by solid-liquid phase reaction on the surface of porous silica. Effect of the composition and pH value of the mobile phase,adding metal ion to the mobile phase on the retentions of polar disubstituted benzenes are studies. The chromatographic mechanism is explained.
    报道在硅胶表面进行固-液相反应合成的3-(氮杂-18-冠-6)丙基键合固定相对金属离子的络合能力和色谱性能,研究了流动相组成、pH值、金属离子对极性二取代苯保留值的影响,探讨色谱分离机理。
短句来源
  di-substituted benzene
    Visible Spectrum Study on Thermodynamics of the Binding Process of Cyclodextrin and Di-substituted Benzene in Aqueous Solution
    水溶液中环糊精和二取代苯包结过程热力学的可见光谱研究
短句来源
  di-substituted benzene
    Visible Spectrum Study on Thermodynamics of the Binding Process of Cyclodextrin and Di-substituted Benzene in Aqueous Solution
    水溶液中环糊精和二取代苯包结过程热力学的可见光谱研究
短句来源
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  disubstituted benzene
Hence, the o-disubstituted benzene derivatives in particular can be separated on a preparative scale from the m- and p-isomers.
      
The ability of these supports to separate ortho, meta and para isomers of some disubstituted benzene derivatives was examined.
      
The results show that two recognition sites and one link spacer of these cyclodextrin dimer derivatives cooperate in separation and affect the separation of disubstituted benzene positional isomers.
      
These β-CDs can separate not only the disubstituted benzene isomers but also some racemic compounds.
      
A comparative study of the retention behaviour of disubstituted benzene derivatives on (2-hydroxy-3-methacryloyloxypropyl β-cyclodextrin-co-N-vinylpyrrolidone) copolymers physically adsorbed onto porous silca gel was achieved.
      
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Eight of the 2,6-Di-substituted benzo-[1,2d;4,5d']-bisoxazoles as well as eight of the 2,6-Di-substituted benzo-[1,2d;5,4d']-bisoxazoles are synthesized.Their m.p.,λmax of UV spectra and fluorescence emission spectra,as well as laser properties are given in tables.

合成了八种2,6-二取代苯并[1,2d;4,5d′]二噁唑和八种2,6-二取代苯并[1,2d;5,4d′]二噁唑,测定了化合物的熔点、紫外光谱、荧光发射光谱及激光性能。

The energy levels of C_6O_2H_2,C_2O_2H_2F_2,C_6O_2H_2(OH)_2and C_6O_2H_2(NH_2)_2 have been calculated by SCF-X_α-SW method.The first ionization energies of these molecules and the photoelectron spectrum of C_6O_2H_4 have also been computed by the same method with the transition state theory.The results are in good agreement with experimental data.The two unusual long bonds in these molecules have been explained by the charge distributions obtained by using SCF-X_α-SW method with a charge-partitioning algorithm....

The energy levels of C_6O_2H_2,C_2O_2H_2F_2,C_6O_2H_2(OH)_2and C_6O_2H_2(NH_2)_2 have been calculated by SCF-X_α-SW method.The first ionization energies of these molecules and the photoelectron spectrum of C_6O_2H_4 have also been computed by the same method with the transition state theory.The results are in good agreement with experimental data.The two unusual long bonds in these molecules have been explained by the charge distributions obtained by using SCF-X_α-SW method with a charge-partitioning algorithm.

本文用多重散射 X_a 方法计算了2,5二取代苯醌系列中的 C_6O_2H_4,C_6O_2H_2F_2,C_6O_2H_2(OH)_2和 C_6O_2H_2(NH_2)_2的能级,用过渡态理论计算了这些分子的第一电离能及苯醌分子的电子能谱,其结果与实验值符合得很好,用电荷分割方法计算了这些分子的电荷分布,进而解释了醌环上出现的两个特别长键的现象.

A series of 5-(1,2-substituted benzimidazolyl)-N, N-dimethyl carbamates had been synthesized. The N-alkyl-4-methoxy-2-nitroanilides were converted into the 1,2-dialkyl-5-methoxy benzimidazoles by reductive cyclization. The technique of phase transfer cataiysis was successfully used in the N-alkylation of anilides and the N,N-dimethyl carbamylation of 5-hydroxybenzimidazoles.The bioactivity on cholinesterases of all these compounds have been tested. The methoiodides were found to be more active than the hudrochlorides....

A series of 5-(1,2-substituted benzimidazolyl)-N, N-dimethyl carbamates had been synthesized. The N-alkyl-4-methoxy-2-nitroanilides were converted into the 1,2-dialkyl-5-methoxy benzimidazoles by reductive cyclization. The technique of phase transfer cataiysis was successfully used in the N-alkylation of anilides and the N,N-dimethyl carbamylation of 5-hydroxybenzimidazoles.The bioactivity on cholinesterases of all these compounds have been tested. The methoiodides were found to be more active than the hudrochlorides.

本文报道了用还原环合法制备1,2-二取代苯骈咪唑,并应用相转移催化反应于N-(4-甲氧基2-硝基苯基酰胺的N-烷化及5-羟基苯骈咪唑的二甲胺基甲酰化,合成了一系列N,N-二甲胺基甲酸5-(1,2-取代苯骈咪唑)酯,其碘甲烷季铵盐有一定的体外抑酶作用。

 
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