碳正离子

其结果证实：在种种分子重排反应中，总是趋向于生成结构更稳定的碳正离子或碳负离子或自由基中间体及其产物。

Their result affirm : in all sorts of molecular rearrangement reactions , anyway tend to produce more stable carbocation , or carboanion , or free radical middle substance and their products .

通过自然键轨道分析发现，过渡态结构越接近碳正离子，质子转移的活化能越高；越接近表面烷氧，则活化能降低。

According to the natural bond orbital analysis , if the transition state is more resemble to the carbocation , the activation energy is higher , whereas , if the transition state is more resemble to the surface alkoxide , the activation energy is lower .

一个估量碳正离子相对稳定性的新指标∑E（AB）~R

Suggesting a new index e_ ( ab ) ~ r for estimating the relative stability of carbonium ions

研究了碳正离子结构和反应物质的量对反应的影响，通过元素分析，IR和1HNMR确证了化合物的结构。

The structure of these compounds were characterized by elemental analysis , IR and ~ 1H NMR .

本文从C&R键键能、R的电负性、顶点原子x等七个方面入手。试图较全面地给出影响非经典碳正离子稳定性的诸因素。

In this paper we try to give factors of influence rather completely on stability of nonclassical carbonium ions from bond energy of C & R bond , electronegativity of R , top-atom X , etc.

由于单分子亲核取代反应（SN1）经过了碳正离子中间体的历程，所以得到的产物是外消旋的。

In the reaction mechanism of unimolecular nucleophilic substitution ( SN1 ), it can produce carbocations which can easily lead to the racemization of the products .

碳正离子1,2-氢或甲基迁移重排机理

The Rearrangement Mechanism of 1,2 Hydrogen or Methyl in Carbenium lons

碳正离子&一种有机化学反应中的活性中间体

Carbonium Ion & an Active Intermediate in Organic Chemistry Reaction

非经典碳正离子问题

STABILITY OF NONCLASSICAL CARBONIUM IONS The Problem of Nonclassical Carbonium lon Classic couture

立体化学研究表明，这些反应都经过碳正离子中间体。

Stereochemistry study suggests that carbocations are generated as intermediates in these reactions .

屏蔽-钻穿常数与碳正离子的稳定性

The Penetrating-Shielding Constant and Its Stability for Carbocation

关于非经典碳正离子之争

The Controversy About Non-classical Carbonium Ion

关于碳正离子的稳定性和反应性

Stability and reactivity of carbenium ions

碳正离子对于水的亲核作用非常灵敏，这是意料中的事。

It would be expected that carbonium ions are very susceptable to nucleo-philic attack by water .

碳正离子的稳定性和反应性热态反应性实时监测及重水堆光激中子本底源的确定

Hot-state reactivity real-time monitoring and the determination of photoneutron background source in heavy water research reactor

另一种是通过碳正离子中间体进行的，它所得到的产物无立体选择性。

The other is conducted amidst carbonium ion intermediate and the product thus brought about has no stereoselectivity .

二茂铁基苯基甲醇与三氟化硼-乙醚溶液在二氯甲烷中作用，形成二茂铁苯基甲基碳正离子。

Reaction of ferrocenylphenylcarbinol with ethereal solution of boron trifluoride in dichloride methane formed the relevant ferrocenylphenylmethyl carbocation .

并利用紫外吸收光谱研究了异构化反应的机理，提出异构化是经过碳正离子中间体的加成&消除反应过程。

This paper also suggests that isomerization through the process of addition & elimination reaction of intermediate of carbocation .

本文用热力学和碳正离子化学的观点，对同碳二元醇的稳定性进行了讨论。

The Stability of gem-diols is discussed and interpreted in this paper in terms of thermodynamics and Carbanium Chcmistry .

本文在前人研究的基础上，提出了一条新的反应机理。计算结果表明，反应是通过一个碳正离子中间体进行的，且邻基参与效应有利于反应中碳正离子的生成。

A new possible reaction pathway is proposed , which is a carbonium ion mechanism with a neighboring-group participation effect .

苯并三氮唑环既可以稳定碳正离子、α-碳碳负离子，又可以稳定α-碳自由基，它是有机化学反应中很好的活化基团。

It can stable both of a-carbon cation , ion and radical , so it is an excellent active group in organic reactions .

在尝试合成香芹酮的过程中，产物149和150的生成证明了非经典碳正离子中间体的存在。

In the attempt to synthesis of carvone , isolation of compounds 149 and 150 provided the non-classical carbonium ion scenario . 4 .

氯甲基化反应由亲电取代反应和亲核取代反应组成，亲核取代反应是反应的速率控制步骤，羟甲基碳正离子（+CH2OH）；是真正有效的亲电试剂。

The chloromethylation reaction consists of electrophilic substitution reaction and nucleophilic substitution reaction , the nucleophilic substitution is the rate-controlling step and the hydroxymethyl cation ( + CH20H ) is the really effective electrophile .

醇和亚磺酰氯反应生成亚磺酸酯，然后在副产物氯化氢的催化下生成碳正离子和亚磺酸，两者结合便生成砜。

Initial reaction of alcohols with sulfinyl chlorides yield sulfinate esters that are ready to decompose in the presence of byproduct HCl , and the resulting carbocations and sulfinic ' acids are coupled to afford sulfones .

研究了3-位不同烷基取代的苯酞类化合物在三氯化铝作用下的重排反应。在重排过程中，既有氢迁移，也会有烷基迁移，这取决于形成的碳正离子的稳定性。

With different side chains at the 3 - position of the phthalide , either hydride transfer or alkyl transfer would take place in the rearrangement reaction depending upon the stability of resulting carbonium species , leading to different products .

在酸性条件下磺酰胺的sp3碳-氮键发生断裂，产生碳正离子，然后与烯烃进行烯化或者[3+2]环化反应。

The sp3 carbon-nitrogen bonds of sulfonamides are cleaved under acidic conditions to generate carbocations , which undergo olefination reaction or [ 3 + 2 ] annulation reaction with alkenes .

用碳自由基的电离能计算其屏蔽一钻穿常数S（R（C））~′，可定量碳正离子的稳定性。

The stability of carbocation was quantified with the penetrating shielding constant SR ' ( C ) obtained basing on . the ionization energy Ip of carbon free radical .