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相关概念视频

Vicinal Diols via Reductive Coupling of Aldehydes or Ketones: Pinacol Coupling Overview01:27

Vicinal Diols via Reductive Coupling of Aldehydes or Ketones: Pinacol Coupling Overview

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Wilhelm Rudolph Fittig discovered the pinacol coupling reaction in 1859. It is a radical dimerization reaction and involves the reductive coupling of aldehydes or ketones in the presence of hydrocarbon solvent to yield vicinal diols.
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Redox Reactions01:24

Redox Reactions

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Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
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Reduction of Alkynes to trans-Alkenes: Sodium in Liquid Ammonia02:10

Reduction of Alkynes to trans-Alkenes: Sodium in Liquid Ammonia

9.0K
Alkynes can be reduced to trans-alkenes using sodium or lithium in liquid ammonia. The reaction, known as dissolving metal reduction, proceeds with an anti addition of hydrogen across the carbon–carbon triple bond to form the trans product. Since ammonia exists as a gas (bp = −33°C) at room temperature, the reaction is carried out at low temperatures using a mixture of dry ice (sublimes at −78°C) and acetone. 
When dissolved in liquid ammonia, an alkali metal,...
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Redox Equilibria: Overview01:23

Redox Equilibria: Overview

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A reduction-oxidation reaction is commonly called a redox reaction. In a redox reaction, electrons are transferred from one species to another rather than being shared between or among atoms. The reducing agent or reductant is the species that loses electrons and gets oxidized in the process. The species that gains electrons and gets reduced in the process is the oxidizing agent or oxidant. Redox reactions are represented as two separate equations called half-reactions, where one equation...
491
Alkenes via Reductive Coupling of Aldehydes or Ketones: McMurry Reaction01:22

Alkenes via Reductive Coupling of Aldehydes or Ketones: McMurry Reaction

1.8K
The radical dimerization of ketones or aldehydes gives vicinal diols through a pinacol coupling reaction. However, the behavior of titanium metals used for the reaction as a source of electrons is unusual. When the reaction is carried out in the presence of titanium, diols can be isolated at low temperatures. Else titanium further reacts with diols, forming alkenes through the McMurry reaction.
1.8K
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

20.4K
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
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相关实验视频

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Chemoselective Modification of Viral Surfaces via Bioorthogonal Click Chemistry
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通过氧反应敏捷的邻近组参与转化介导的共价适应性网络.

Wenyu Dong1, Yuxin Luo1, Junlu Zhang1

  • 1School of Materials Science & Engineering, Beijing Institute of Technology, Beijing, 100081, China.

Angewandte Chemie (International ed. in English)
|April 17, 2025
PubMed
概括

本研究介绍了使用双循环[3.3.1]非 (BCN) 交联器和基于的邻群参与 (NGP) 的无催化剂共价适应性网络 (CAN). 这些动态网络提供高效的回收,维修和再加工,具有可调节的特性.

关键词:
共价适应性网络是共价适应性网络.动态的共价化学邻近的集团参与降解毒素的反应能力是一种.

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科学领域:

  • 聚合物化学 聚合物化学
  • 材料科学 材料科学 材料科学
  • 有机化学 有机化学

背景情况:

  • 联适应性网络 (CAN) 往往依赖外部催化剂进行交叉连接器交换,由于催化剂浸出和降解,阻碍了再处理能力.
  • 开发无催化剂的动态聚合物网络对于可持续材料和先进应用至关重要.

研究的目的:

  • 开发一种新的无催化剂动态聚合物网络系统.
  • 调查基于的邻群参与 (NGP) 的使用,以促进 CAN 中高效的交叉链接器交换.
  • 探索开发网络的化学可回收性,可修复性和可调节的动态行为.

主要方法:

  • 采用了一种设计用于利用基于的NGP的bicyclo[3.3.1]nonane (BCN) bis-alkyl halide交叉连接器.
  • 研究了热介导的C─N基交换用于键解离和结合.
  • 描述了由此产生的离子网络的流动行为和动态特性.

主要成果:

  • 在没有外部催化剂的情况下实现了高效的交叉连接器交换,从而实现了快速的债券交换和流动.
  • 证明了离子网络具有内在的抗微生物特性.
  • 在温和条件下成功回收,修复和重新处理网络.
  • 展示了通过原子的可逆氧化还原反应来调节网络动态的能力.

结论:

  • 一个基于NGP的新型无催化剂的CAN成功地使用 BCN交叉连接器和开发出来.
  • 开发的CAN在温和条件下表现出极好的再加工性,可回收性和可修复性.
  • 网络的动态行为可以通过的氧化还原活性来调节,为高性能,可调节的动态材料提供潜力.