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相关概念视频

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

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Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
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Reduction of Alkenes: Catalytic Hydrogenation02:13

Reduction of Alkenes: Catalytic Hydrogenation

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Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...
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Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation01:28

Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation

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Unlike the easy catalytic hydrogenation of an alkene double bond, hydrogenation of a benzene double bond under similar reaction conditions does not take place easily. For example, in the reduction of stilbene, the benzene ring remains unaffected while the alkene bond gets reduced. Hydrogenation of an alkene double bond is exothermic and a favorable process. In contrast, to hydrogenate the first unsaturated bond of benzene, an energy input is needed; that is, the process is endothermic. This is...
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Preparation of Alkynes: Alkylation Reaction02:27

Preparation of Alkynes: Alkylation Reaction

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Introduction
Alkylation of terminal alkynes with primary alkyl halides in the presence of a strong base like sodium amide is one of the common methods for the synthesis of longer carbon-chain alkynes. For example, treatment of 1-propyne with sodium amide followed by reaction with ethyl bromide yields 2-pentyne.
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Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

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Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
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Catalysis02:50

Catalysis

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The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
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最近在乙烯的催化转化方面取得了进展.

Xin Yu1,2, Shifa Zhu1,3,4

  • 1State Key Laboratory of Bio-based Fiber Materials, School of Chemistry and Chemical Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, China. zhusf@zstu.edu.cn.

Chemical Society reviews
|May 6, 2025
PubMed
概括
此摘要是机器生成的。

本综述涵盖了乙催化转换的最新进展,重点关注过渡金属和光催化反应. 这些方法通过各种中间体有效地将乙转化为有价值的化合物.

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科学领域:

  • 有机化学 有机化学
  • 催化剂是一种催化剂.
  • 合成化学 合成化学

背景情况:

  • 乙是一种基础工业化学品,在现代有机合成中具有新的重要性.
  • 乙的催化转化为高价值化合物提供了原子经济和高效的途径.

研究的目的:

  • 为最近在乙催化转化方面的突破提供全面的回顾.
  • 突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出突出

主要方法:

  • 专注于过渡金属催化反应 (例如,涉及基金属,乙化物,金属循环,黄金碳素,基-Ni复合物).
  • 讨论光催化/促进的转化,包括乙烯基基质中间体.
  • 分析每个类别的反应机制和衍生.

主要成果:

  • 概述了不同乙转化过程中的关键发展.
  • 详细介绍了各种反应中间体在催化循环中的作用.
  • 说明了现代乙烯化学的多功能性和范围.

结论:

  • 乙的催化转化是一个快速发展的领域,具有重要的合成效用.
  • 了解反应机制和中间体对于开发新型乙转化至关重要.
  • 这些进展为更高效,更可持续的复杂分子合成铺平了道路.