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相关概念视频

Carboxylic Acids to Methylesters: Alkylation using Diazomethane01:33

Carboxylic Acids to Methylesters: Alkylation using Diazomethane

2.9K
Carboxylic acids react with diazomethane in an ether solvent via alkylation at the carboxylate oxygen atom to give methyl esters of the corresponding acid with excellent yields.
2.9K
ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH301:11

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

7.3K
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...
7.3K
Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide02:44

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

12.6K
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.
12.6K
Preparation of Nitriles01:12

Preparation of Nitriles

2.6K
One of the common methods to prepare nitriles is the dehydration of amides. This method requires strong dehydrating agents like phosphorous pentoxide or boiling acetic anhydride for converting amides to nitriles. Another reagent namely, thionyl chloride also accomplishes the dehydration of amides, where amide acts as a nucleophile. The first step of the mechanism involves the nucleophilic attack by the amide on the thionyl chloride to form an intermediate. In the next step, the electron pairs...
2.6K
1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Mechanism01:37

1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Mechanism

4.8K
Nitrous acid is a relatively weak and unstable acid prepared in situ by the reaction of sodium nitrite and cold, dilute hydrochloric acid. In an acidic solution, the nitrous acid undergoes protonation when it loses water to form a nitrosonium ion—an electrophile. Nitrous acid reacts with primary amines to give diazonium salts. The reaction is called diazotization of primary amines.
4.8K
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

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[DPEPhosbcpCu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst
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用Pd/SiC催化可见光驱动的N-甲基化,使用甲甲对酸.

Dongfang Hou1, Ruifeng Guo2, Xianshu Dong2

  • 1Center for Analysis Testing and Equipment Sharing of TYUT, Taiyuan University of Technology, Taiyuan 030024, China.

Nanomaterials (Basel, Switzerland)
|September 26, 2025
PubMed
概括

这项研究引入了一种新的方法,用于光催化N-甲基化芳香化合物,使用碳化物 (Pd/SiC) 上的纳米粒子. 这种高效的工艺在温和条件下提供高活性和选择性.

关键词:
如果是SiC SiC甲基化处理的方法化物化合物 化物化合物光催化作用的光催化作用

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科学领域:

  • 催化剂是一种催化剂.
  • 材料科学 材料科学 材料科学
  • 有机化学 有机化学

背景情况:

  • 芳香化合物是有机合成中的重要前体.
  • 有效和选择性的N-甲基化方法对于生产有价值的氨酸衍生物至关重要.
  • 现有的方法通常需要恶劣的条件或多个步骤.

研究的目的:

  • 为芳香化合物开发一种单,高活性和选择性的光催化N-甲基化方法.
  • 研究纳米颗粒在碳化 (Pd/SiC) 上在这种转化中的作用.
  • 阐明增强的催化活性和选择性背后的机制.

主要方法:

  • 通过液相减少在SiC上支持的主导Pd(111) 暴露平面的Pd纳米颗粒的制备.
  • 在温和反应条件下使用甲作为甲基化剂的芳香化合物的光催化甲基化.
  • 分析催化活性,选择性和反应机制.

主要成果:

  • 在芳香化合物的单N-甲基化中达到高的光催化活性和选择性到N,N-甲基氨.
  • 证明Pd和SiC之间的Mott-Schottky接触增强了电子转移,促进了催化活性.
  • 表明Pd纳米颗粒促进基组的选择性化,随后进行直接甲基化,绕过形式化.

结论:

  • Pd/SiC纳米颗粒是芳酸化合物的光催化N-甲基化非常有效的催化剂.
  • 在Pd/SiC接口的独特电子特性和Pd纳米颗粒的催化功能是观察到的效率和选择性的关键.
  • 这种方法提供了一种可持续和温和的方法来合成N,N-甲基兰衍生物.