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相关概念视频

Mass Spectrometry: Molecular Fragmentation Overview01:20

Mass Spectrometry: Molecular Fragmentation Overview

The ionization of a molecule into a molecular ion inside the mass spectrometer causes instability in the molecule's structure due to the loss of an electron. This eventually leads to the fragmentation or breaking of some bonds in the molecule. The fragmentation occurs predominantly at specific bonds to yield relatively stable fragments.
One type of fragmentation pattern is the cleavage of a single bond in the molecular ion. The cleavage leads to a radical and a cation. The cleavage can occur at...
Directing and Steric Effects in Disubstituted Benzene Derivatives01:18

Directing and Steric Effects in Disubstituted Benzene Derivatives

When disubstituted benzenes undergo electrophilic substitution, the product distribution depends on the directing effect of both substituents. When the directing effects of both substituents reinforce each other, a single product is obtained. For example, bromination of p-nitrotoluene occurs ortho to the methyl group and meta to the nitro group, which is the same position, resulting in a single product. However, if the directing effects of the two groups oppose each other, the more strongly...
Stability of Conjugated Dienes01:28

Stability of Conjugated Dienes

Introduction
A comparison of the enthalpies of hydrogenation of dienes reveals that conjugated dienes release less heat on hydrogenation, rendering them more stable than their nonconjugated analogs.
Mass Spectrometry: Branched Alkane Fragmentation01:29

Mass Spectrometry: Branched Alkane Fragmentation

This lesson delves into the mass spectrometry of branched alkane fragmentation. Branched alkanes possess secondary or tertiary carbon atoms, which generate relatively stable carbocations if the cleavage occurs at the branching point. The high stability of carbocations drives the instant fragmentation of branched alkanes. Accordingly, the branched alkane's molecular ion peak is very weak or invisible in the mass spectra, especially in comparison to a linear alkane.
Mass Spectrometry: Cycloalkene Fragmentation00:54

Mass Spectrometry: Cycloalkene Fragmentation

The molecular ions of cycloalkenes undergo fragmentation via a retro-Diels–Alder reaction.
Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry01:29

Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry

Diels–Alder reactions between cyclic dienes locked in an s-cis configuration and dienophiles yield bridged bicyclic products.

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相关实验视频

Updated: Jul 15, 2026

Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of Chain Transfer Polymerization
07:28

Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of Chain Transfer Polymerization

Published on: November 27, 2015

1-(2-尼托) 乙烯的光解裂涉及两个并行路径,产品的释放速度受到常见半乙中间体分解的限制.

John E T Corrie1, Andreas Barth, V Ranjit N Munasinghe

  • 1National Institute for Medical Research, The Ridgeway, Mill Hill, London NW7 1AA, UK. jcorrie@nimr.mrc.ac.uk

Journal of the American Chemical Society
|July 10, 2003
PubMed
概括

闪光光电解1 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 乙烯基乙烯的闪光光电解揭示了一种长寿命的半乙烯基中间体. 它的缓慢分解限制了产品的释放,与这种光化学反应中更快的酸中间体衰变形成对比.

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On-line Analysis of Nitrogen Containing Compounds in Complex Hydrocarbon Matrixes
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Utilization of Stop-flow Micro-tubing Reactors for the Development of Organic Transformations
13:09

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Published on: January 4, 2018

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Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of Chain Transfer Polymerization
07:28

Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of Chain Transfer Polymerization

Published on: November 27, 2015

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07:49

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Published on: August 5, 2016

Utilization of Stop-flow Micro-tubing Reactors for the Development of Organic Transformations
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科学领域:

  • 摄影化学的使用.
  • 有机化学 有机化学
  • 频谱学是一种光谱学.

背景情况:

  • 众所周知,1-(2-尼托菲尼尔) 乙烯经历光解分解.
  • 了解反应机制和中间体对于合成应用至关重要.

研究的目的:

  • 为了研究1 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 的闪光光光电解的反应机制.
  • 描述光解分解过程中的中间体和速率限制步骤.

主要方法:

  • 时间分辨率的里埃变换红外光谱 (FTIR) 光谱.
  • 时间分辨率的紫外线可见 (UV-vis) 光谱学.
  • 产品分析 产品分析
  • 半经验性PM3和AMSOL计算

主要成果:

  • 确定了一种长寿命的半乙中间体,其分解是限制产品释放的速度.
  • 在pH 7.0.0下,乙酸中间体的衰变速度明显快 (5020s-1) 比产品释放速度快 (0.11s-1).
  • 血的形成通过两个相互竞争的途径 (快速~80%,缓慢~20%),只有较小的途径与酸衰变有关.
  • 计算研究表明,酸同位素的pKa影响路径分区.

结论:

  • 1-(2-尼托菲尼尔) 乙烯乙烯的光解涉及到一个独特的,速度限制的半乙中间体.
  • 竞争的反应通路和异构体的pKa在整体光解机制中发挥着关键作用.
  • 这些发现与相关的2-二乙烯相反,突出了光化学中的结构特异性.