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相关概念视频

Acids, Bases and Neutralization Reactions03:26

Acids, Bases and Neutralization Reactions

An acid-base reaction is one in which a hydrogen ion, H+, is transferred from one chemical species to another. Such reactions are of central importance to numerous natural and technological processes, ranging from the chemical transformations within cells or lakes and oceans to the industrial-scale production of fertilizers, pharmaceuticals, and other substances essential to the society.
Acid-Catalyzed Hydration of Alkenes02:45

Acid-Catalyzed Hydration of Alkenes

Alkenes react with water in the presence of an acid to form an alcohol. In the absence of acid, hydration of alkenes does not occur at a significant rate, and the acid is not consumed in the reaction. Therefore, alkene hydration is an acid-catalyzed reaction.
Acid-Catalyzed α-Halogenation of Aldehydes and Ketones01:21

Acid-Catalyzed α-Halogenation of Aldehydes and Ketones

By replacing an α-hydrogen with a halogen, acid-catalyzed α-halogenation of aldehydes or ketones yields a monohalogenated product
In the first step of the mechanism, the acid protonates the carbonyl oxygen resulting in a resonance-stabilized cation, which subsequently loses an α-hydrogen to form an enol tautomer. The C=C bond in an enol is highly nucleophilic because of the electron-donating nature of the –OH group. Consequently, the double bond attacks an electrophilic halogen to form a...
Aldol Condensation with β-Diesters: Knoevenagel Condensation01:27

Aldol Condensation with β-Diesters: Knoevenagel Condensation

The Knoevenagel condensation is an aldol-type reaction involving the condensation of aldehydes or ketones with active methylene compounds such as β-diesters to produce substituted olefins.
Acids, Bases and Neutralization Reactions01:27

Acids, Bases and Neutralization Reactions

Acids and bases play several important roles in biology. The pH of a biological system can significantly impact the function of biological molecules, including enzymes, proteins, and nucleic acids. For example, enzymes have optimal pH ranges for their activity, and changes in pH can denature or alter their structure, affecting their function. Acids and bases also play a crucial role in cellular signaling and communication. The pH of the extracellular fluid around cells can influence the...
Leveling Effect01:29

Leveling Effect

In acid-base chemistry, the leveling effect refers to the limitation imposed by the solvent on the strength of acids and bases in solution. When a base stronger than the solvent's conjugate base is used, it deprotonates the solvent until the base is entirely consumed, making it ineffective against weaker acids. Conversely, an acid stronger than the solvent's conjugate acid protonates the solvent until the acid is depleted, rendering it ineffective against weaker bases. Essentially, the solvent...

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相关实验视频

Updated: Jul 15, 2026

Hydrophobic Salt-modified Nafion for Enzyme Immobilization and Stabilization
11:16

Hydrophobic Salt-modified Nafion for Enzyme Immobilization and Stabilization

Published on: July 11, 2012

和的有机催化直接迈克尔反应与盐水中的β-酸.

Nobuyuki Mase1, Kaori Watanabe, Hidemi Yoda

  • 1Department of Molecular Science, Faculty of Engineering, Shizuoka University, 3-5-1 Johoku, Hamamatsu 432-8561, Japan.

Journal of the American Chemical Society
|April 13, 2006
PubMed
概括

研究人员使用海水或盐水创建了一个直接的,不对称的迈克尔反应,消除有机溶剂. 这种绿色化学方法在迈克尔反应中使用了一种新型催化剂,以获得高产量和酶体过量.

科学领域:

  • 有机化学 有机化学
  • 绿色化学 绿色化学
  • 催化剂是一种催化剂.

背景情况:

  • 迈克尔反应是有机合成中的一个基本的碳-碳键形成反应.
  • 传统的迈克尔反应通常需要有机溶剂,这给环境和经济带来了挑战.
  • 开发无溶剂或对环境无害的反应条件是可持续化学的一个关键目标.

研究的目的:

  • 开发一种直接的,不对称的迈克尔反应,在水性介质,特别是盐水或海水中有效运行.
  • 设计和使用一种新的双功能催化剂,能够在这些绿色条件下促进反应.
  • 在不需要有机溶剂的情况下,在迈克尔反应中实现高产量和酶选择性.

主要方法:

  • 开发了一种具有长度疏水性基链的双功能催化剂.
  • 在盐水或海水中作为唯一溶剂进行不对称的迈克尔反应.
  • 反应条件的优化,以最大限度地提高产量和反体过量.

主要成果:

  • 在盐水和海水中成功执行直接,不对称的迈克尔反应.
  • 双功能催化剂表现出高效率,提供理想的产品在优良的产量.
  • 实现了高的反体过量,即使反应物的稳定度比.

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Tuning the Acidity of Pt/ CNTs Catalysts for Hydrodeoxygenation of Diphenyl Ether
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A Microwave-Assisted Direct Heteroarylation of Ketones Using Transition Metal Catalysis
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A Microwave-Assisted Direct Heteroarylation of Ketones Using Transition Metal Catalysis

Published on: February 16, 2020

相关实验视频

Last Updated: Jul 15, 2026

Hydrophobic Salt-modified Nafion for Enzyme Immobilization and Stabilization
11:16

Hydrophobic Salt-modified Nafion for Enzyme Immobilization and Stabilization

Published on: July 11, 2012

Tuning the Acidity of Pt/ CNTs Catalysts for Hydrodeoxygenation of Diphenyl Ether
09:21

Tuning the Acidity of Pt/ CNTs Catalysts for Hydrodeoxygenation of Diphenyl Ether

Published on: August 17, 2019

A Microwave-Assisted Direct Heteroarylation of Ketones Using Transition Metal Catalysis
07:06

A Microwave-Assisted Direct Heteroarylation of Ketones Using Transition Metal Catalysis

Published on: February 16, 2020

结论:

  • 为不对称的迈克尔反应建立了一种新的,环保的方法.
  • 开发的催化剂在水性介质中有效,为传统方法提供了可持续的替代方案.
  • 这项工作在绿色有机合成方面取得了重大进展,减少了对有机溶剂的依赖.