Carbonium

Carbonium Ion & an Active Intermediate in Organic Chemistry Reaction

碳正离子&一种有机化学反应中的活性中间体

Study on the stability of the carbonium ions

正碳离子稳定性的量子化学研究

Molecular orbital interaction and catalytic activity of carbonium of molecular sieve zeolites

分子筛中轨道相互作用及其C~+的催化活性

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

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。

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

一个估量碳正离子相对稳定性的新指标∑E（AB）~R

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

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。

Carbonium ions in solution derive much of their stability from solvation effects and are formed more easily in more polar media .

正碳离子在溶液中由溶剂效应获得更高的稳定性，而且在极性较高的介质中更容易形成。

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

非经典碳正离子问题

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

碳正离子对于水的亲核作用非常灵敏，这是意料中的事。

The Controversy About Non-classical Carbonium Ion

关于非经典碳正离子之争

A molecular lumped kinetic model has been established based on the classic carbonium ions reaction mechanism to represent the FCC gasoline reaction network through reasonable hypothesis and simplification .

应用经典正碳离子反应机理合理简化催化裂化汽油的催化反应网络，建立了一种接近分子水平的集总反应动力学模型；

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

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。

The results showed that the dewatered ionic liquid could still catalyze the alkylation , and the carbonium mechanism was established through the GC-MS analysis of the reaction liquid product .

结果表明，脱水后的离子液体仍然可以催化烷基化反应，液体产物的GC-MS分析结果支持正碳离子机理。

While thiophene molecules were under the catalytic cracking conditions , their carbonium ions were very active and reacted easily with α - olefins from the paraffin cracking reaction .

当噻吩处在催化裂化条件下，正碳离子反应活跃，易与烷烃裂化生成的α烯烃加成，进一步与烷烃发生氢转移饱和后裂化脱硫。

On metal active sites the dealkylation reaction follows adsorption and dehydrogenation mechanism , while on acid sites the dealkylation follows hydrogen transfer mechanism , carbonium ion chain reaction mechanism or free radical mechanism .

在金属活性中心上，烷基芳烃遵循吸附脱氢的反应机理；在酸性中心上可能遵循H转移、链式正碳离子以及自由基机理。

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.

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。

The results indicated that the main initiating event was the generation of a penta-coordinated carbonium ion by the protonation of paraffin in the feedstock , and the following reactions took place via monomolecular mechanism .

研究结果表明，MIP技术反应过程中，催化循环链的引发主要是原料中烷烃质子化，产生五配位正碳离子，使链反应遵循单分子的质子化裂化反应机理。

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 .

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。

The leaf spot of Gardenia jasminoides is a kind of fungal disease . The most suitable temperature for mycelium grow is 24.8 ℃, pH 7.0 , the carbonium is glucose and the relative humidity is 75 % .

栀子花叶斑病是一种真菌性病害，菌丝生长的最适温度为24.8℃，pH值为7.0，碳源为葡萄糖，湿度为75%。