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Preparation of Amines: Reduction of Oximes and Nitro Compounds01:29

Preparation of Amines: Reduction of Oximes and Nitro Compounds

4.0K
Oximes can be reduced to primary amines using catalytic hydrogenation, hydride reduction, or sodium metal reduction. The reduction of aliphatic and aromatic nitro compounds to primary amines takes place by either catalytic hydrogenation or by using active metals like Fe, Zn, and Sn in the presence of an acid.
Though catalytic hydrogenation can reduce nitrobenzenes, the reduction is nonselective in the presence of other functional groups. For instance, if nitrobenzene contains an aldehyde group,...
4.0K
Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN101:14

Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN1

2.2K
Treating arylamines with nitrous acid gives aryldiazonium salts that are effective substrates in nucleophilic aromatic substitution reactions. The diazonio group in these salts can be easily displaced by different nucleophiles, yielding a wide variety of substituted benzenes. The leaving group departs as nitrogen gas, and this easy elimination is the driving force for the substitution reaction.
In the Sandmeyer reaction, for example, the diazonio group is replaced by a chloro, bromo,...
2.2K
Nucleophilic Aromatic Substitution: Elimination–Addition01:11

Nucleophilic Aromatic Substitution: Elimination–Addition

4.1K
Simple aryl halides do not react with nucleophiles. However, nucleophilic aromatic substitutions can be forced under certain conditions, such as high temperatures or strong bases. The mechanism of substitution under such conditions involves the highly unstable and reactive benzyne intermediate. Benzyne contains equivalent carbon centers at both ends of the triple bond, each of which is equally susceptible to nucleophilic attack. This 50–50 distribution of products is...
4.1K
Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide02:44

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

10.8K
Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
10.8K
Nucleophilic Aromatic Substitution: Addition–Elimination (SNAr)01:30

Nucleophilic Aromatic Substitution: Addition–Elimination (SNAr)

4.0K
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...
4.0K
ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH301:11

ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH3

6.3K
All ortho–para directors, excluding halogens, are activating groups. These groups donate electrons to the ring, making the ring carbons electron-rich. Consequently, the reactivity of the aromatic ring towards electrophilic substitution increases. For instance, the nitration of anisole is about 10,000 times faster than the nitration of benzene. The electron-donating effect of the methoxy group in anisole activates the ortho and para positions on the ring and stabilizes the corresponding...
6.3K

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Updated: Sep 9, 2025

Synthesis of Antiviral Tetrahydrocarbazole Derivatives by Photochemical and Acid-catalyzed C-H Functionalization via Intermediate Peroxides CHIPS
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Synthesis of Antiviral Tetrahydrocarbazole Derivatives by Photochemical and Acid-catalyzed C-H Functionalization via Intermediate Peroxides CHIPS

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简单而高效的芳香C-H氧化

Qiu Shi1, Yu Huang1, Wenbo H Liu1

  • 1School of Chemistry, Sun Yat-sen University, Guangzhou 510006, China.

Precision chemistry
|August 29, 2025
PubMed
概括
此摘要是机器生成的。

这项研究引入了一种高效的芳香C-H氧化法,为功能化提供了直接的途径. 这种多功能有机合成技术简化了复杂分子的制造,

关键词:
芳香C-H功能化芳香电友替代后期的功能化没有金属氧化物

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科学领域:

  • 有机化学
  • 合成方法
  • 医学化学

背景情况:

  • 芳香性素是有机化学中有价值的合成物,作为指导组,配体和受保护的碳酸.
  • 现有的合成芳香氧醇的方法通常依赖于碳酸或其衍生物,因此需要更直接的方法.
  • 与传统的多步合成相比,芳香C-H键的直接功能化提供了更节省原子和更高效的策略.

研究的目的:

  • 开发一种简单,高效和广泛适用的C-H芳香氧化方法.
  • 在多样性导向合成 (DOS) 和目标导向合成 (TOS) 中展示这种新的转换的实用性.
  • 阐明反应机制,将其确定为电友芳香替代.

主要方法:

  • 使用一种新型的催化系统直接氧化芳香C-H键.
  • 测试了各种各样的芳香基质以确定反应的范围和局限性.
  • 为了了解反应途径,进行了机械研究,包括同位素标记和控制实验.

主要成果:

  • 成功开发了一种具有广泛基质范围的高效芳香C-H氧化反应.
  • 开发的方法应用于功能化领域的多样性导向合成.
  • 这种转化成功地用于针对目标的四种不同的药物分子的合成,展示了其实际可用性.

结论:

  • 开发的芳香C-H氧化物代表了合成有机化学的重大进步.
  • 这种方法提供了一个简单而直接的途径,以获得有价值的含有素的芳香化合物.
  • 预计这种转化将被广泛采用用于C-H功能化,在复杂分子合成中发挥指导组或掩盖的碳酸的作用.