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相关概念视频

Reactions of Carboxylic Acids: Introduction01:41

Reactions of Carboxylic Acids: Introduction

3.3K
Carboxylic acids possess an acidic –COOH functional group. The acidity can be attributed to the resonance stabilization of their conjugate base, wherein the negative charge is delocalized over both oxygen atoms.
3.3K
Acid Halides to Carboxylic Acids: Hydrolysis01:01

Acid Halides to Carboxylic Acids: Hydrolysis

2.9K
Hydrolysis of acid halides is a nucleophilic acyl substitution reaction in which acid halides react with water to give carboxylic acids. The reaction occurs readily and does not require acid or a base catalyst.
As shown below, the mechanism involves a nucleophilic attack by water at the carbonyl carbon to form a tetrahedral intermediate. This is followed by the reformation of the carbon–oxygen π bond along with the departure of a halide ion. A final proton transfer step yields carboxylic...
2.9K
Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

2.1K
The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael...
2.1K
Carbocations02:10

Carbocations

11.8K
Carbocations are one of the reaction intermediates formed during several nucleophilic substitutions or elimination reactions. A carbocation is an electron-deficient species with the central carbon atom having six electrons and three bonded atoms. The central carbon in a carbocation is sp2 hybridized with trigonal planar geometry. It has an empty p orbital perpendicular to the plane of the structure that can accept electrons. Thus, carbocations act as strong electrophiles and may react with any...
11.8K
Preparation of Carboxylic Acids: Carboxylation of Grignard Reagents01:13

Preparation of Carboxylic Acids: Carboxylation of Grignard Reagents

5.0K
Carboxylic acids can be prepared by the carboxylation of Grignard reagents (RMgX). This method is convenient for converting alkyl (primary, secondary or tertiary), vinyl, benzyl, and aryl halides to carboxylic acids with one additional carbon than the starting RMgX.
5.0K
Radical Reactivity: Nucleophilic Radicals01:16

Radical Reactivity: Nucleophilic Radicals

2.2K
Radicals adjacent to electron-donating groups are called nucleophilic radicals. These radicals readily react with electrophilic alkenes. The SOMO–LUMO interactions are the driving force for the reaction, where the high-energy SOMO of the electron-rich, nucleophilic radicals interacts with the low-energy LUMO of the electron-deficient, electrophilic alkenes. Such SOMO–LUMO interactions are the basis of reactive radical traps, affecting the selectivity in radical reactions. For...
2.2K

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Updated: Sep 26, 2025

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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通过微滴捕获反应性碳离子

Anubhav Kumar1, Supratim Mondal1, Mohammad Mofidfar2

  • 1Department of Chemistry, Indian Institute of Science Education and Research Tirupati, Tirupati 517507, India.

Journal of the American Chemical Society
|April 22, 2022
PubMed
概括
此摘要是机器生成的。

水性微滴稳定了有机反应中的短暂的碳中间体,通过质谱仪实现实时检测. 这一突破为反应机制和稳定提供了新的见解.

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Microfluidic Pneumatic Cages: A Novel Approach for In-chip Crystal Trapping, Manipulation and Controlled Chemical Treatment
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科学领域:

  • 有机化学
  • 物理化学
  • 分析化学

背景情况:

  • 碳离子是许多有机和生物反应中的过渡中间体.
  • 水性环境通常会导致碳酸的快速灭绝,限制了它们的研究.
  • 由于它们的寿命短,直接观察卡尔巴尼是具有挑战性的.

研究的目的:

  • 研究水性微滴捕获和稳定反应性中间体的潜力.
  • 能够实时检测和研究经典有机反应中的碳离子.
  • 探索溶剂组成和电荷密度对碳捕获效率的影响.

主要方法:

  • 使用水性微滴来隔离和稳定中间体.
  • 使用脱电喷射电离质谱仪 (DESI-MS) 进行检测.
  • 研究了四种经典的有机反应:阿尔多尔和诺维纳格尔凝结,基化和雷默-蒂曼反应.
  • 不同的溶剂组成 (例如,水-甲醇混合物与纯水) 和微滴电荷密度.

主要成果:

  • 从四种不同的有机反应中成功捕获和稳定了carbanion中间体.
  • 能够实时检测这些难以捉摸的物种,
  • 与纯水相比,水甲醇微滴在捕获碳离子方面表现出更好的表现.
  • 在微滴中观察到碳离子和碳离子之间的歧视行为,与之前的发现形成对比.

结论:

  • 水性微滴为稳定和研究反应性中间体提供了一个新平台.
  • 这种技术可方便实时对有机反应进行机械研究.
  • 微滴溶剂成分在充电中间体的稳定中起着至关重要的作用,水-甲醇混合物对carbanions有效.