Orientation Effect of the Methoxy on the Reaction of Electrophilic Aromatic Substitution 甲氧基在苯甲醚亲电取代反应的定位作用
Because the reaction initiated by the attachment of an electrophile, the process is called an electrophilic addition reaction. 因为反应是由亲电试剂的附加而开始的,所以这个过程叫做亲电加成反应。
Four conditions against Markovnikov'rule on electrophilic addition to alkenes and alkyl halides are discussed, and a theoretical explanation is made as well. 介绍了烯烃与卤化氢的亲电加成反应中四种反马氏规则的类型,并作出了理论解释。
The rate constants of radical and electrophilic addition to alkenes are dominated by different factors. 烯烃的自由基加成和亲电加成速率受不同的因素控制。
By comparing VNS with the electrophilic substitution and nucleophilic substitution of nitro aromatic, the definition of VNS is explained. 将VNS与硝基芳环的亲电反应、亲核反应做比较,阐述了VNS的定义;
The Electrophilic Reaction of NBS with Substituted Benzene and its Application NBS与取代苯的亲电反应及其应用
Reactivity of electrophilic substitutions of different positions on phenanthrene are discussed according to the theory of Resonance, PMO method and EHMO method. 利用共振论、PMO法、EHMO法,对菲亲电取代反应各位点的活性进行了解释。
Recent development of the palladium-catalyzed Stille cross-coupling reactions is reviewed, which includes ( 1) the reactions of organotin compounds with organic electrophilic reagents such as aro-matic halides, alkyl halides, and acyl chlorides etc. 综述了钯催化Stille交叉偶联反应的最新研究进展,主要包括三个方面:(1)有机锡化合物与有机亲电试剂如卤代芳香烃、卤代烷烃、酰氯等的反应;
Conclusions GMA with electrophilic group could react with negatively charged centers on DNA and form GMA DNA adducts. 结论具有亲电子集团的GMA能与DNA带负电荷中心反应形成GMA-DNA加合物。
The substituting position of electrophilic group accord with experimental value. 亲电基取代位置和实验值完全一致。
Study of Reaction of Aromatic Electrophilic Substitution 芳香族亲电取代反应的研究
While the inactive electrophilic reagents can take place the reaction at high temperature also. 不活泼的亲电试剂在较高温度下也能较好的进行。
Electrophilic addition, which is the principal reaction of cyclization; 亲电加成,它是成环的主要反应;
Attempts to trap the enamine intermediate with several electrophilic reagents were not successful. 此外也尝试了利用最初形成的烯胺中间体与一些亲电试剂发生串连反应,但未能取得成功。
Studies of Phase Transfer Catalysis in the Electrophilic Substitution ── Relation between the Catalytic Power and the Structure 亲电取代反应中相转移催化剂结构和性能的关系
The analysis of band structure shows: the replacement of N changes the structural variety and increases electrophilic or nucleophilic mixed active points, but intrinsic conductive property does not improve. 能带结构分析表明:N的取代改变了结构的多样性,增多了亲电或亲核掺杂的活性点,但本征导电性能未得到改善。
The double bond of cyclopentenyl on Cp with HBr, halogen underwent normal electrophilic addition reaction. 茂环上环戊烯基的双键与HBr和卤素发生正常的亲电加成反应。
It will become deepen to the students'recognization in mechanism of Aryl electrophilic substitution. 这些问题的讨论将深化学生对芳烃亲电取代反应机理的认识。
Studies on Use of NMR for the Aromatic Electrophilic Substitution Reaction NMR在芳基亲电取代反应中的应用研究
The local electronegativity scale and the activity of electrophilic reaction of conjugated molecules 共轭芳烃分子的定域电负性标度及亲电反应活性
Synthesis of the substance from aniline and hexafluoroacetone involves electrophilic addition, acylation and reduction. 其合成一般是以苯胺和六氟丙酮为起始原料,经过亲电加成、酰化和还原三步反应。
Predication of Reactive Sites in Electrophilic Substitution of Heterocycles and Mono Substituted Heterocycles by Condensed Fukui Function Fukui函数在传统杂环及单取代杂环亲电取代反应中的活性部位预测
It is postulated that this charge transfer complexing between the two electrophilic groups in sesquiterpenoids and the bases in double helix of DNA or/ and RNA may contribute to the antitumor mechanism of this class of compounds. 作者据此提出了倍半萜类抗癌剂的两个亲电活性基团分别与RNA或DNA的双股核苷酸链上的碱基发生电荷转移络合的抗癌机理。
In our thesis, we made a summary of iodine participated electrophilic reactions and reported our studies on this. 本文研究了I2参与的亲电反应,主要对亲电环化反应这一部分作了小结。
And just like the generation of chiral product of any reaction, asymmetric information may be affected in the MBH reaction of any one of the four components, so the activation-optically active, electrophilic reagents, catalyst and solvent. 和生成手性产物的任何反应一样,不对称信息可能存在于影响MBH反应的四个组分的任何一个中,即光学活性的活化烯,亲电试剂、催化剂和溶剂。
The preliminary study concerning on the electrophilic cyclization reactions of the carbamate products were also conducted. 本论文还开展了以上述氨基甲酸炔丙酯产品为底物的亲电环化反应的初步探索研究。
It has a wide application in many areas, such as explosive, propellant, chemical intermediates, medicine and pesticide. On the other hand, the mechanism research on aromatic plays an important role in the development of electrophilic substitution theory. 一方面,其产物可广泛地应用于炸药、推进剂、化工原料、医药和农药等许多领域;另一方面,芳烃硝化机理的研究对亲电取代反应基础理论发展起了很大的作用。
The selectivity of this reactions depended on the steric hindrance of the electrophilic groups. 并且通过进一步的研究发现,该反应的顺反选择性,取决于亲电基团的位阻大小。
The carbon atom of ethyl diazoacetate is not only electrophilic and nucleophilic, but also is a dipolar ion, so the reaction about it is varied. 重氮乙酸乙酯的碳原子既具有亲电性又具有亲核性,而且是一个偶极离子,所以它的反应是多种多样的。