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相关概念视频

Preparation and Reactions of Thiols02:33

Preparation and Reactions of Thiols

7.0K
Thiols are prepared using the hydrosulfide anion as a nucleophile in a nucleophilic substitution reaction with alkyl halides. For instance, bromobutane reacts with sodium hydrosulfide to give butanethiol.
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Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

Cycloaddition Reactions: MO Requirements for Photochemical Activation

2.3K
Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
2.3K
Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

2.0K
The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
2.0K
Radical Formation: Homolysis00:54

Radical Formation: Homolysis

4.0K
A bond is formed between two atoms by sharing two electrons. When this bond is broken by supplying sufficient energy, either two electrons can be taken up by one atom forming ions by the cleavage called heterolysis, or the two electrons are shared by two atoms, with one each creating radicals by the cleavage called homolysis.
4.0K
Labeling DNA Probes03:31

Labeling DNA Probes

8.7K
DNA probes are fragments of DNA labeled with a reporter tag to enable their detection or purification. The resulting labeled DNA probes can then hybridize to target nucleic acid sequences through complementary base-pairing, and may be used to recover or identify these regions.
Radioisotopes, fluorophores, or small molecule binding partners like biotin or digoxigenin, are the most widely used reporter tags for labeling DNA probes. These labels can be attached to the probe DNA molecule via...
8.7K

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相关实验视频

Updated: Nov 6, 2025

Constructing Thioether/Vinyl Sulfide-tethered Helical Peptides Via Photo-induced Thiol-ene/yne Hydrothiolation
11:09

Constructing Thioether/Vinyl Sulfide-tethered Helical Peptides Via Photo-induced Thiol-ene/yne Hydrothiolation

Published on: August 1, 2018

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一种自催化可见光驱动的醇结合

Leona L Rodrigues1,2, Aaron S Micallef1,2, Michael C Pfrunder1,2

  • 1Centre for Materials Science, Queensland University of Technology, 2 George Street, Brisbane, Queensland 4000, Australia.

Journal of the American Chemical Society
|May 6, 2021
PubMed
概括

一种新型的可见光诱导结合系统产生醇以快速添加醇-迈克尔. 这种无添加剂的自催化方法简化了化学合成和聚合物修饰.

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Chemoselective Modification of Viral Surfaces via Bioorthogonal Click Chemistry
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Facile Synthesis of Worm-like Micelles by Visible Light Mediated Dispersion Polymerization Using Photoredox Catalyst
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Chemoselective Modification of Viral Surfaces via Bioorthogonal Click Chemistry
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Facile Synthesis of Worm-like Micelles by Visible Light Mediated Dispersion Polymerization Using Photoredox Catalyst
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科学领域:

  • 有机化学
  • 摄影化学
  • 聚合物化学

背景情况:

  • 常规光触发的烯/烯反应通常需要添加剂,如光基,有机光催化剂或激素光启动剂.
  • 这些添加剂可能会使反应条件和净化过程复杂化.

研究的目的:

  • 开发一种高效,无添加剂的可见光触发的结合系统.
  • 使用一种新型的光诱导重组来产生反应性.
  • 证明该系统在聚合物终端组修改中的实用性.

主要方法:

  • 一种可见光诱导的*o*-thiopyrinidylbenzaldehyde (*o*TPyB) 的重新排列,以产生硫.
  • 通过皮里丁介导的光生成的自催化结合.
  • 随后的无添加剂醇-迈克尔添加与缺电子/.

主要成果:

  • 这项研究首次描述了光诱导的TPyB重组.
  • 在没有外部添加剂的情况下,结合系统有效运行.
  • 聚合物终端组修改成功实现了极好的终端组保真性.

结论:

  • 开发的可见光诱导系统提供了一种高效且无添加剂的醇-迈克尔添加方法.
  • 这种方法简化了合成过程,适用于聚合物功能化.
  • 自催化性和可见光激活为化学结合提供了更绿色的替代方案.