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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

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Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
2.0K
Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

2.2K
Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists...
2.2K
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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Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

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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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相关实验视频

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Simple Methods for the Preparation of Non-noble Metal Bulk-electrodes for Electrocatalytic Applications
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使用CPET介质的电催化金属化物生成

Subal Dey1,2, Fabio Masero1, Enzo Brack1

  • 1Department of Chemistry and Applied Biosciences, ETH Zürich, Zurich, Switzerland.

Nature
|July 21, 2022
PubMed
概括

我们开发了一种使用协同质子电子转移 (CPET) 介质生成过渡金属化物 (M-H) 的新方法. 这一策略增强了二氧化碳到酸 (HCOOH) 的电催化转化,提高了能源效率.

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科学领域:

  • 催化剂
  • 电化学
  • 材料科学

背景情况:

  • 过渡金属化物 (M-H) 是催化和酶反应中的关键中间体,参与H+/H2相互转化和CO2减少.
  • 有效的M-H形成是提高催化过程能量效率的关键.
  • 选择性电化学二氧化碳降解为酸 (HCOOH) 需要使用温和质子源轻松生成M-H.

研究的目的:

  • 通过协同的质子电子转移 (CPET) 介质引入一种用于电催化MH生成的新策略.
  • 评估化物 (Mn-H) 生产的二氧化碳电还原到HCOOH的效率.
  • 确定最佳的CPET调解剂,以提高HCOOH生产的选择性.

主要方法:

  • 研究的CPET调解剂与二氧化碳电降解的[MnI(bpy) ((CO) 3Br]催化剂结合使用.
  • 测试了从CO到HCOOH的产品选择性的反转,以评估Mn-H的产生.
  • 使用现场光谱技术来证明Mn-H的形成和确定热力学边界.

主要成果:

  • 使用CPET调解器证明了电催化M-H的产生.
  • 实现了对HCOOH生产而不是CO的增强选择性.
  • 鉴定出一种合成的铁硫聚合物是产生HCOOH的优质CPET媒介.

结论:

  • 通过CPET调解器策略,可以有效和选择性地产生电催化M-H.
  • 这种方法为从二氧化碳中生产酸提供了一个基准催化系统.
  • 这些发现为提高二氧化碳利用的能源效率铺平了道路.