substituent

The degree of branch structure is related to the ion-pair, which is the substituent group connected to N atom in alkyne, and the steric effect of the Lewis Base. The branch structure can be restrained by controlling the chain transfer reaction.

其支化程度与离子对的结构，即炔酰胺上N原子相连取代基和路易斯碱的位阻大小有关，可通过对链转移反应的抑制控制支化程度。

Scheme 1 started from o-nitro ethylbenzene. It was actually a model study of Bamberger reaction to test the method for an extended Bamberger reaction to give 5-methoxy substituent.

路线一是从邻硝基乙苯出发、探索Bamberger反应的模型实验。

Regression analysis and test of significance showed that it can well interpret the relationship between substituent and~ ( 13) C NMR based on the number of valence electrons and mulliken charge, and interpret the contribution of conjugated effect.

回归分析及显著性检验表明，根据原子的价电子数和电荷，能够很好地解释化学位移与取代基之间的变化规律，且能够较好地考虑共轭效应的影响。

Solid-Phase Organic Synthesis of Heterocyclic Compounds Containing Bromo or Iodo Substituent Using Recyclable Polystyrene-Supported Selenium Bromide

可循环使用的聚苯乙烯负载硒溴试剂参与含溴（碘）取代的杂环化合物的固相有机合成

The oxidation peak current of 1,4-DHP is decreased and the peak position is shifted to the positive direction when bound with CT DNA, while the degree of these phenomena is decreased with the increase of the steric hindrance of the substituent at the C-4 position.

1,4-DHP与ct DNA结合后，氧化峰峰电流降低和峰电位正移程度随着C-4取代基的空间位阻增大而减小。

Their UV spectra and fluorescence spectra have been studied. The results shows that they have high fluorescence quantum efficiency and their photoluminescence are different with different substituent groups or with different length of conjugated chain.

研究了此类分子化合物的紫外光谱和荧光光谱，具有较高的荧光量子效应，随着取代基和共轭链长度的不同，其光致发光也表现出一定的差别；

Also , the substituent species and the position on phenyl ring effects the reaction.

苯环上取代基的种类及位置对反应也有影响.

A novel substituent descriptor based on the 17 different physicochemical parameters about the electronic, hydrophobic and steric properties of substituents is used to describe the chemical structures of 22 cyclic ureas and 22 N, N-dimethyl-2-bromo ( substituted phenyl) ethylamine derivatives, respectively.

把取代基电性、立体及疏水性物化参数组合建立一种新取代基描述方法，对环尿素类和N，N-二甲基-2-溴苯乙胺类衍生物进行结构表征。

The fluorescence intensity of porphyrin also relates to the substituent positions on the phenyl groups.

此外,荧光强度还与卟啉的苯环上取代基的取代位置有关.

The corresponding aldehyde acetals were obtained in almost quantitative yields when alcohols were treated with aromatic aldehydes bearing an electron-withdrawing substituent such as a nitro group.

当强吸电子的芳香醛为底物如硝基取代的苯甲醛时，几乎定量给出相应的缩醛产物。

The tacticity of polymers is mainly influenced by the polarity of substituent group of vinyl monomer.

作者认为影响聚合物等规度的因素主要是取代基的极性效应。

Study on Substituent Effect of Ruthenium(ⅱ) Tris 1, 10 Phenanthroline Complexes by 13 C NMR Spectra

用~（13）C-NMR研究菲咯啉钌配合物的取代效应

It has also been found that, the polymerization rate of cyclic phosphoester monomer is highly depended on the structure of pendant side group and the ring substituent group when using stannous octoate as the catalyst.

研究还发现，以异辛酸亚锡为催化剂的磷酸酯单体的聚合速率与磷酸酯单体的侧基、环取代基密切相关，而且可以方便利用聚磷酸酯侧基对高分子进行功能化修饰。

Homolytic Bond Dissociation Energies of Allylic Compounds and Related Substituent Effects

烯丙位化学键均裂离解能及其取代基效应

Effect of Substituent Groups on the Electronic Properties of a Molecular Wire

取代基对分子线电子性质的影响

In order to improve the hole mobility of PT and lower the HOMO and broaden the absorption spectrum, a novel conjugated polymer, poly ( thienylene-vinylene-thienylene) with cyano substituent ( CN-PTVT) was synthesized.

为进一步有效地提高聚噻吩的空穴迁移率、降低聚合物的HOMO能级以及拓宽聚合物的吸收光谱，设计合成了一种新型的腈基取代的聚（噻吩-乙烯-噻吩）的聚合物CN-PTVT。

The substituent is deuterium.

取代基是重氢.

This set of objective substituent constants can also be applied to aromatic nucleophilic substitution not any less adequately than that derived by J. Miller right from this very type of reactions.

这套客观的取代基常数用之于芳香亲核取代反应不比Miller从该反应系中求出的数值差。

Studies of the effect of substituent on IHE tension of Tetrahedrane

四面体碳烷张力的取代基影响研究

Study on the Molecule Stability of Aristolochia Acid with Different Substituent

不同取代基马兜铃酸分子稳定性研究

Property dependence of ABA triblock copolymers on the terminal substituent of azobenzene was investigated.

研究了偶氮苯端基取代基时ABA三嵌段共聚物性能的影响.

An equation correlating the electronic transition energy with substituent and solvent effect in aromatic conjugated systems was derived on the basis of perturbation molecular orbital theory.

推导出芳香共轭体系的电子跃迁能与取代基效应以及溶剂效应之间的关系方程式。

The spectroscopic properties of HBQ and its derivatives were investigated. We have mainly focused our discussion on the substituent effect and solvent effect.

对10-羟基苯并喹啉及其衍生物的光谱性能进行了分析研究，重点考察取代基效应和溶剂效应。

The DFT Study of VO ( pa)_2 Complex and Substituent Effect on py

VO（pa）2配合物及py上取代基效应的DFT研究

The results show that the potential of the oxidation peak of 1,4-DHP ( E_ ( pa)) becomes more positive, and the oxidation process is more difficult with an increase in the electron-attractive ability of the substituent at the C-4 position.

结果表明，1,4-DHP在GC电极上的氧化峰峰电位（EPa）随着C-4取代基的吸电子能力增强而升高，氧化反应越来越难进行。

By contrast, the exo adduct possesses a trans relationship between the dienophile electron-withdrawing group and the trans diene substituent.

相反，不能进行成环加成反应的反应物有吸电子基团的二烯和二烯烃取代物具有反式结构。

Notes on the medium substituent test in tissue culture of sugar-cane

甘蔗组织培养育苗的培养基代用品试验

H-Abstraction from p-Substituted Benzaldehydes by Bis-perfluoroalkyl Nitroxides ── A New Attempt for Establishing Substituent Constants of Spin Delocalization σ by EPR Method

双－全氟烷基氮氧自由基从取代苯甲醛的攫氢反应&用EPR方法建立取代基自旋离域参数σ的新尝试

Another important application of sulfonated aluminum phthalocyanines containing halogen substituent is its photo sterilization.

甲脒亚磺酸（用于丝毛还原染料印花）磺酸基卤素铝酞菁的另一个重要应用为光学杀菌性。

The conjugation between the isolated electron pair at N atom in CCN group and the π electrons on the aniline ring framework& n-π conjugation, and the electronic effect of the substituent in p-position of aniline ring are very subordinate factors.

CCN基团上N的孤电子对与苯胺环π电子的共轭nπ共轭，以及苯胺环对位上取代基的电子效应是很次要的因素。