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相关概念视频

Esters to Carboxylic Acids: Acid-Catalyzed Hydrolysis01:13

Esters to Carboxylic Acids: Acid-Catalyzed Hydrolysis

2.8K
Hydrolysis of esters under acidic conditions proceeds through a nucleophilic acyl substitution. In the presence of excess water, the reaction proceeds in a reversible manner, forming carboxylic acids and alcohols.
During hydrolysis, the ester is first activated towards nucleophilic attack through the protonation of the carboxyl oxygen atom by the acid catalyst. The protonation makes the ester carbonyl carbon more electrophilic. In the next step, water acts as a nucleophile and adds to the...
2.8K
Carboxylic Acids to Esters: Acid-Catalyzed (Fischer) Esterification Overview01:20

Carboxylic Acids to Esters: Acid-Catalyzed (Fischer) Esterification Overview

17.9K
The Fischer esterification reaction was developed by the German chemist Emil Fischer in 1895. It is a condensation reaction between carboxylic acids and alcohols in an acidic medium to give esters and water.
17.9K
Carboxylic Acids to Esters: Acid-Catalyzed (Fischer) Esterification Mechanism01:13

Carboxylic Acids to Esters: Acid-Catalyzed (Fischer) Esterification Mechanism

7.8K
Carboxylic acids react with alcohols to yield esters via an acid-catalyzed condensation reaction called Fischer esterification. This is a nucleophilic acyl substitution reaction that proceeds via a tetrahedral intermediate, where a water molecule is eliminated as the leaving group.
7.8K
Regioselective Formation of Enolates01:33

Regioselective Formation of Enolates

2.6K
As depicted in the figure below, the unsymmetrical ketones can form two possible enolates:  less substituted or more substituted enolates. Usually, the thermodynamic enolates are formed from the more substituted α-carbon atom, while the kinetic enolates are formed faster by deprotonation from the less substituted position. The thermodynamic enolates have lower energy, so they are  more stable. But the energy required to form kinetic enolates is less.
2.6K
Esters to β-Ketoesters: Claisen Condensation Mechanism01:08

Esters to β-Ketoesters: Claisen Condensation Mechanism

3.6K
Regular Claisen condensation involves the synthesis of β-ketoesters by combining identical ester molecules bearing two α hydrogens in the presence of an alkoxide base. The reaction commences with the deprotonation of the acidic α hydrogen by the base to form a resonance stabilized ester enolate. This nucleophilic ion then attacks the carbonyl center of another ester molecule to generate a tetrahedral alkoxide intermediate. Next, the expulsion of the alkoxide group from the...
3.6K
Alkylation of β-Diester Enolates: Malonic Ester Synthesis01:14

Alkylation of β-Diester Enolates: Malonic Ester Synthesis

3.4K
Malonic ester synthesis is a method to obtain α substituted carboxylic acids from ꞵ-diesters such as diethyl malonate and alkyl halides.
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Utilization of Stop-flow Micro-tubing Reactors for the Development of Organic Transformations
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在微结构反应堆中对化和转化的动力学方面.

Xingjun Yao1, Zhenxue Wang1, Ming Qian1

  • 1Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology, School of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng 252059, China.

Molecules (Basel, Switzerland)
|August 10, 2024
PubMed
概括

微反应器提高化学工程转移和控制精确的动力参数的确定. 本综述强调了测量微反应动力学的进步,特别是对于化和转化过程.

关键词:
化化化是一种.动力学确定性的决定.微流体中的微流体.微型反应堆的使用通过转化进行转化.

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科学领域:

  • 化学工程是化学工程的重要组成部分.
  • 反应动力学反应动力学
  • 微流体学 微流体学

背景情况:

  • 与传统系统相比,微结构反应堆提供了优越的质量和热传递.
  • 在这些反应堆中,精确的微流体控制对于准确的动力学研究至关重要.
  • 了解反应动力学对于优化化学过程至关重要.

研究的目的:

  • 审查最近在测量微反应动力学方面的进展.
  • 探索动态建模,机制和方程的化和转化.
  • 讨论微反应堆与先进的监测和控制技术的整合.

主要方法:

  • 关于微反应动力学测量的文献综述.
  • 动力建模和内在动力方程的分析.
  • 检查微包装床反应器以优化分散和动力学.
  • 微反应器与光谱分析的整合,用于实时监测.
  • 讨论微处理模拟软件和控制原则.

主要成果:

  • 微结构反应器允许精确确定反应动力学参数.
  • 微包装式反应堆有效地将微分散与反应动力学相结合.
  • 与光谱方法的高级集成允许有效的数据采集.
  • 在线测量,自动化和数字化增强了动力学研究.

结论:

  • 微反应器代表了研究反应动力学的重大进步.
  • 微反应器与数字技术的整合为流程优化提供了巨大的潜力.
  • 未来的应用可能会利用人工智能来进一步推进微反应动力分析.