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相关概念视频

Diazonium Group Substitution: –OH and –H01:19

Diazonium Group Substitution: –OH and –H

3.3K
Nitrous acid, a weak acid, is prepared in situ via the reaction of sodium nitrite with a strong acid under cold conditions. This nitrous acid prepared in situ reacts with primary arylamines to form arenediazonium salts. Such reactions are known as diazotization reactions. As shown in Figure 1, the formation of arenediazonium salts begins with the decomposition of nitrous acid in an acidic solution to give nitrosonium ions.
3.3K
Stability of Substituted Cyclohexanes02:30

Stability of Substituted Cyclohexanes

14.9K
This lesson discusses the stability of substituted cyclohexanes with a focus on energies of various conformers and the effect of 1,3-diaxial interactions.
The two chair conformations of cyclohexanes undergo rapid interconversion at room temperature. Both forms have identical energies and stabilities, each comprising equal amounts of the equilibrium mixture. Replacing a hydrogen atom with a functional group makes the two conformations energetically non-equivalent.
For example, in...
14.9K
Nucleophilic Substitution Reactions02:34

Nucleophilic Substitution Reactions

19.2K
Historical perspective
In 1896, the German chemist Paul Walden discovered that he could interconvert pure enantiomeric (+) and (-) malic acids through a series of reactions. This conversion suggested the involvement of optical inversion during the substitution reaction. Further, in 1930, Sir Christopher Ingold described for the first time two different forms of nucleophilic substitution reactions, which are known as SN1 (nucleophilic substitution unimolecular) and SN2 (nucleophilic substitution...
19.2K
¹H NMR of Labile Protons: Deuterium (²H) Substitution00:48

¹H NMR of Labile Protons: Deuterium (²H) Substitution

1.3K
This lesson illustrates the role of deuterium substitution in simplifying the NMR spectrum of compounds comprising labile protons. One method employed is the use of deuterium. Amongst the three isotopes of hydrogen, deuterium (2H) has a nucleus composed of one proton and one neutron. When the D2O solvent is added to a pure dry ethanol solution, its labile proton is substituted with deuterium.
1.3K
Nucleophilic Aromatic Substitution: Addition–Elimination (SNAr)01:30

Nucleophilic Aromatic Substitution: Addition–Elimination (SNAr)

4.7K
Nucleophilic substitution in aromatic compounds is feasible in substrates bearing strong electron-withdrawing substituents positioned ortho or para to the leaving group. The reaction proceeds via two steps: the addition of the nucleophile and the elimination of the leaving group.
The reaction begins with an attack of the nucleophile on the carbon that holds the leaving group. This results in the delocalization of the π electrons over the ring carbons. The resonance interaction between...
4.7K
Predicting Products: Substitution vs. Elimination02:52

Predicting Products: Substitution vs. Elimination

13.9K
When a nucleophile and an alkyl halide react, nucleophilic substitution and β-elimination reactions compete to generate products.
The following factors can influence the mechanisms competing against each other:
13.9K

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相关实验视频

Updated: Jan 27, 2026

Isolating Free Carbenes, their Mixed Dimers and Organic Radicals
10:44

Isolating Free Carbenes, their Mixed Dimers and Organic Radicals

Published on: April 19, 2019

11.6K

黄金 (III) 替代碳素

Rui Wei1, Shuo Li1, Nina Albouy2

  • 1Laboratoire Hétérochimie Fondamentale et Appliquée (LHFA, UMR 5069), CNRS/Université de Toulouse, 31062 Toulouse, France.

Journal of the American Chemical Society
|January 26, 2026
PubMed
概括
此摘要是机器生成的。

新的黄金 (III) 替代的二化合物被合成和光解以产生碳素. 这些碳素表现出独特的分子内和分子间反应性,为金碳素化学提供了洞察力.

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Luminophore Formation in Various Conformations of Bovine Serum Albumin by Binding of GoldIII
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Luminophore Formation in Various Conformations of Bovine Serum Albumin by Binding of GoldIII

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Photogeneration of N-Heterocyclic Carbenes: Application in Photoinduced Ring-Opening Metathesis Polymerization
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相关实验视频

Last Updated: Jan 27, 2026

Isolating Free Carbenes, their Mixed Dimers and Organic Radicals
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Isolating Free Carbenes, their Mixed Dimers and Organic Radicals

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11.6K
Luminophore Formation in Various Conformations of Bovine Serum Albumin by Binding of GoldIII
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Luminophore Formation in Various Conformations of Bovine Serum Albumin by Binding of GoldIII

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Photogeneration of N-Heterocyclic Carbenes: Application in Photoinduced Ring-Opening Metathesis Polymerization
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科学领域:

  • 有机金属化学
  • 摄影化学
  • 碳化合物化学

背景情况:

  • 黄金 (III) 复合物越来越多地因其独特的电子和硬质性质而受到研究.
  • 迪亚佐化合物作为碳生成的多功能前体.
  • 了解碳的反应性对于开发新合成方法至关重要.

研究的目的:

  • 合成和表征新的Au (III) 替代的二氧化化合物.
  • 调查Au (III) 碳的光解生成和反应性.
  • 使用计算方法探索替代剂对碳化合物行为的影响.

主要方法:

  • 通过与化化合物反应合成Au(III) 替代的化合物.
  • 使用紫外线照射进行光解以诱导二挤出和碳素形成.
  • 使用光谱技术和X射线晶体学对碳化合物的表征.
  • 密度函数理论 (DFT) 计算用于结构和反应性分析.

主要成果:

  • 成功合成了被Au (III) 替代的二化合物 (N^C^C) AuC (N2) R (R=Dmp,SiMe3).
  • 通过光解二挤出产生的Au (III) 碳.
  • (N^C^C) Au-C-Dmp 炭基经过了分子内C-H的插入和β-H的消除.
  • 在溶液中, (N^C^C) Au-C-SiMe3 碳素表现出单基和三基碳素的反应性.
  • DFT计算提供了对碳化合物结构,结合和反应机制的见解.

结论:

  • 新型Au (III) - 碳素可以从二前体光分解生成.
  • 替代剂的硬质和电子因素影响了Au (III) 碳的反应性.
  • 这些发现扩大了有机金化学和碳变化的范围.