亲核性

芳胺空间位阻越小，亲核性越强，副反应越容易发生，产物除草活性越低。

As steric hindrance of the aryl amine decreased and nucleophilicity increased , occurrence of the transfor-mation reaction increased and herbicidal activity of the product decreased .

整个反应的历程取决于噻唑卡宾的亲核性，而卡宾前体在有机溶剂中的溶解性对反应也有较大的影响。

It is ascertained the whole tandem reaction sequence pivots on the nucleophilicity of thiazole carbenes , and the solubility of thiazolium precursors has an enormous effect on the reactions .

本文基于金与炔基的亲核性，开发了一例荧光增强型罗丹明类Au3+荧光探针RY，探针合成简单，收率较高。

We have developed an enhanced fluorescent probe RY for Au3 + based on rhodamine . The probe was easily synthesized with high yield .

反应过程中，HF酸中的活性成分（HF）2或HF-2吸附于石英玻璃表面，对Si原子产生亲核性侵蚀使Si&O键断裂，而H+对反应起催化作用。

During the reaction , the nucleophilic attack of ( HF ) _2 or HF ~ - _2 on silicon atom results in the breaking of siloxane bond , while H ~ + ions adsorbed on the surface of silica glass can catalyze the reaction .

亲核性芳香取代。多取代苯衍生物合成的策略。

Strategies in the Synthesis of Multisubstituted Benzene Derivatives .

从碳原子上移走一质子，是产生亲核性碳的最普通手段。

The most general means of generating carban nucleophiles involves removal of a proton from a carbon .

基于硫醇基的强亲核性，常常通过一些亲核反应来对其和其他氨基酸进行识别。

Strongly nucleophilic thiol group , we often by nucleophilic reaction to identification it and other amino acids .

质子捕获作用，即亲核性试剂捕获质子，抑制质子的不可控引发和链转移反应；

B.The " proton-scavenging " & the removal of protic impurities by externally added nucleophiles and the elimination of " induced " chain transfer ;

实验证明，该偶联反应在路易斯酸和质子酸的作用下均能够获得较为理想的结果。实验结果从分说明了这类活化烯烃的α？位具有较强的亲核性。

The experimental results prove that the reaction can catalyze by either Lewis acid or protonic acid and show high nucleophilic abilities of the α? position of these polarized alkenes .

丙烯醇和苯甲醇由于氧原子上的电子能与双键产生共轭而使氧上的电子云密度降低，亲核性减弱，因而转化率较低。

To allyl alcohol and benzyl alcohol , the paired electrons of oxygen can be conjugated with double bond and thus the electron cloud density decreased , so the nucleophilicity was decreased .

双环笼状亚磷酸酯类衍生物由于其笼状结构所引起的张力及高位阻性，使得它同一般直链亚磷酸酯类化合物相比，在亲核取代反应性等方面有着明显的不同。

Compared with straight chain phosphites , caged bicyclic phosphites have great differences in nucleophilic reactions due to the tension and high steric hindrance caused by the caged bicyclic structure .

利用原子键电负性均衡方法研究了β丙内酯与不同亲核试剂的反应性。

The chemical reactivity of β propiolactone with different nucleophiles is studied by use of atom bond electronegativity equalization method .

从电性角度讨论了有机物分子的亲电性和亲核性问题，并阐述了两者在有机合成中的应用。

In this paper , electroaffinity and nucleophilicity of organic compound have been investigated , and their application in organic synthesis also has been discussed .

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。

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 .

并且对亲核试剂的体积效应、溶剂效应对亲核性影响，底物上吸电子基团的数目、吸电子能力对亲电性的影响，以及亲核取代反应的发生部位受哪些因素影响进行探讨。

At the same time , discuss about the impact factor to nucleophilicity such as the number of attract electron group 、 ability of attract electron and the nucleophilic substitution reaction part .

氢氧化铯可以与有机弱酸作用，形成亲核的碳负离子或杂原子负离子，由于铯离子与阴离子之间的静电力较弱，使与之键合的阴离子表现出强的亲核性。

Cesium hydroxide can reaction with organic weak acid to form carbon anion or nucleophilic heteroatom anions . Because the static electricity between the cesium ion and anion is weak , so the anions demonstrated strong nucleophilic .