取代反应

NMR在芳基亲电取代反应中的应用研究

Studies on Use of NMR for the Aromatic Electrophilic Substitution Reaction

X射线光电子能谱计算结果表明烷基取代反应主要发生在壳聚糖的氨基上。

It was found by X-ray photoelectron spectroscopy ( XPS ) that the alkyl substitution reaction was mainly on amine groups of chitosan .

β－苯乙胺N－取代反应中的重排反应

A New Rearrangement in N - Substitution of β - Phenylethylamine

β－苯乙胺的N－取代反应过程中反应物和产物的反相HPLC分离测定

Reversed-phase HPLC Determination of the Reactant and Product of N-Substitution of β - Phenylethylamine

若C2位置由离去集团，则可以发生亲核芳香取代反应。

Nucleophilic aromatic substitution takes place with leaving groups at C2 .

从金属羰基化合物和氧原子转移试剂两个方面讨论了影响CO取代反应速率的各种因素。

Various factors relating to the metal carbonyls and to the O atom transfer reagents that effect the rates of CO substitution are discussed .

[Ni（NH3）6]Cl2与NaNO2的固相配位取代反应研究

The Solid State Substitution Reaction of [ Ni ( NH_3 ) _6 ] Cl_2 With NaNO _2

SH2取代反应的动力学探讨

The Study of Dynamics on S_H2 Reaction

而当R为吸电子基团-CHO、-COCH3时，主要发生分子内氮原子上的亲核取代反应，产物为含氮的五员杂环化合物。

In contrast , electro-withdrawing groups CHO and COCH_ 3 on the attacking site will favor the intramolecular nucleophilic substitution of nitrogen and form 5-membered heterocyclic compounds .

离子液体中的Mannich反应和钯催化的烯丙基取代反应研究

Studies on Mannich Reaction and Palladium-Catalyzed Allylation in Ionic Liquids

用气相色谱研究[Co（NH3）4CO3]Cl与NH4SCN取代反应中配合物的结构变化

Study on Structure Changed of Substitution Reaction of [ Co ( NH_3 ) _4CO_3 ] Cl and NH_4SCN

卤代烷亲核取代反应的一种新机理&S（RN）1

A New Mechanism of Nucleophilic Substitution Reactions for Alkyl Halides & S_ ( RN ) 1

目前，通过C-C键连的取代反应还未见其他报道。

At present , the substitution reaction through C-C bond has not been reported yet .

分子的化学位移与反应活性有密切联系：化合物α位氢原子的δH值愈小，该化合物亲电取代反应活性愈高；

The chemical shift has a close relation with the reaction activeness : the smaller the δ _H value of the alpha position hydrogen in the compound , the higher the electricity substitution activeness .

Vicarious亲核取代反应研究进展

Recent progress on Vicarious nucleophilic substitution reaction

提出自由基IPSO亲核取代反应机理。

A radical IPSO substitution mechanism is proposed .

芳香族硝基化合物与苯硫酚钠盐的亲核取代反应&自由基IPSO取代机理

Studies on the Reaction of Aromatic Nitro Compounds with Sodium Phenylthiolate & Radical IPSO Substitution Mechanism

在亲核取代反应中；无论按SN1历程还是SN2历程，烯丙式卤代烃的反应速度都是最快的。

In the substitution reaction of nucleophilic , whatever we use S_N1 or S_N2 reaction course , the rate of reaction is the most rapid .

最终产物的ee值与中间体α-羟基酮十分接近，表明在所发生的亲核取代反应中基本没有消旋化得现象发生。

The ee values of the final products were very close to those of α - hydroxy ketones , which indicated that no racemization occurred in the substitution .

方法应用小型回旋加速器，通过18O（p，n）18F核反应生产出18F离子，由亲核取代反应制备18F-FDG，并对所制备的18F-FDG注射液进行质量控制。

METHODS 18F-FDG was synthesized via nuclear reaction 18O ( p , n ) 18F on 18O-enriched water and nucleophilic substitution reaction by Tracerlab Mx FDG synthesis system .

利用金属离子的取代反应以TPPS4荧光法测定微量钴

Fluorometric Determination of Microamounts of Cobalt by Metal - Substitution

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。

Reactivity of electrophilic substitutions of different positions on phenanthrene are discussed according to the theory of Resonance , PMO method and EHMO method .

本论文提出一种可以在均相溶液中快速灵敏的检测SNP的方法，它基于熵驱动分子开关和恒温聚合酶链取代反应而构建，并且不需要额外加入引物。

A strategy of rapidly and sensitively detecting SNP in homogeneous solution was presented based on entropy-driven molecular switch and isothermal strand - displacement polymerase amplification reaction without addition of exogenous primers .

焦脱镁叶绿酸a甲酯与溴素的亲电反应表明：在3位乙烯基上发生亲电加成反应，而与20位的meso氢则发生亲电取代反应。

The electrophilic reaction of methyl pyropheophorbide-a ( MPP-a ) demonstrates that the electrophilic addition reaction and the electrophilic substitution reaction occur on the vinyl group at 3-position and 20-meso-position , respectively .

结果表明，壳聚糖合成HTCC的取代反应主要发生在壳聚糖的氨基上；

Results show that the substitution reaction occurred mainly on the amine groups of chitosan .

水解反应的可能机理是SNl和SN2.双分子亲核取代反应立体化学问题释疑

The mechanisms of the hydrolysis were proposed to be unimolecular nucleophilic substitution and bimolecular nucleophilic substitution ( SN2 ) . On the Problem of Bimolecular Nucleophilic Substitution Reaction Sterochemistry

方法先合成rutaecarpine，再进行N-取代反应，合成目标化合物，并测试所合成化合物的体外抗血小板聚集活性。

Methods Rutaecarpine was prepared , then the target compounds were synthesized from rutaecarpine via N-substitution . Their anti-platelet aggregation activities were determined in vitro .

分别用液溴和NBS进行Br-的取代反应，比较了两种方法的收率和操作，提高了收率，优化了方法。

Substitution reaction of Br - carried with liquid bromine and NBS , which to compare the two methods in yield and operation , improve yeild and optimize the method . 3 .

氢的替代亲核取代反应（VNS）是与硝基芳环的亲电反应、亲核反应不同的一种新反应。

Vicarious nucleophilic substitution ( VNS ) of hydrogen is a new type of reaction which is differ-ent from the usual electrophilic and nucleophilic reactions of the nitro arenes .

用从头计算方法和密度泛函理论（DFT）研究了5-氧杂三环[7.4.1.03,7]-1,3（7），8,10,12-十四碳五烯合成过程中取代反应和环氧化反应的反应机理。

The reaction mechanisms of displacement reaction and epoxidation reaction during the synthesis of 5-oxatricyclo [ 7.4.1.03,7 ] tetradeca-1,3 ( 7 ), 8,10,12-pentaene have been studied by using ab initio molecular orbital theory and density functional theory ( DFT ) .