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関連する概念動画

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

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...
Ligand Binding and Linkage00:49

Ligand Binding and Linkage

Allosteric proteins have more than one ligand binding site; the binding of a ligand to any of these sites influences the binding of ligands to the other sites. When a protein is allosteric, its binding sites are called coupled or linked.  In the case of enzymes, the site that binds to the substrate is known as the active site and the other site is known as the regulatory site. When a ligand binds to the regulatory site, this leads to conformational changes in the protein that can influence the...
Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration02:34

Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration

The rate of acid-catalyzed hydration of alkenes depends on the alkene's structure, as the presence of alkyl substituents at the double bond can significantly influence the rate.
Heterogeneous Catalysis01:22

Heterogeneous Catalysis

Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...
Diels–Alder Reaction Forming Cyclic Products: Stereochemistry01:28

Diels–Alder Reaction Forming Cyclic Products: Stereochemistry

The Diels–Alder reaction is one of the robust methods for synthesizing unsaturated six-membered rings. The reaction involves a concerted cyclic movement of six π electrons: four π electrons from the diene and two π electrons from the dienophile.
[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.

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関連する実験動画

Updated: Jun 8, 2026

Preparation of SNS Cobalt(II) Pincer Model Complexes of Liver Alcohol Dehydrogenase
06:31

Preparation of SNS Cobalt(II) Pincer Model Complexes of Liver Alcohol Dehydrogenase

Published on: March 19, 2020

形状的に柔軟な二次元サルフェン複合体は,二機能触媒用である.

Sergei I Vagin1, Robert Reichardt, Stephan Klaus

  • 1Wacker Lehrstuhl für Makromolekulare Chemie, Technische Universität München, Lichtenbergstrasse 4, D-85748 Garching, Germany.

Journal of the American Chemical Society
|September 25, 2010
PubMed
まとめ

ディメリッククロミウムサルフェン触媒は,生物分解性ポリマーの生産における強化された活性を示しています. この二機能触媒アプローチは,ポリメリゼーションおよび共ポリメリゼーション反応における触媒改善のための新しい戦略を提供します.

科学分野:

  • 協調化化学について
  • ポリマーサイエンスの科学
  • カタリシス カタリシス カタリシス

背景:

  • サルフェンリガンドは,金属複合体を設計するための多用途の支架です.
  • 二機能触媒は反応効率と選択性を高めることができます.
  • クロミウム複合体は,ポリメリゼーションの応用のために研究されています.

研究 の 目的:

  • モノメールおよび二次クロミウムサルフェン触媒の合成と特徴付け.
  • β-ブチロラクトンポリメリゼーションとCO(2) /プロピレン酸化物共ポリメリゼーションにおけるこれらのシステムの触媒性能を評価する.
  • ダイメリゼーションとスペーサーの長さの触媒活性に対する影響を調査する.

主な方法:

  • 柔軟に結合された二次元サルフェンリガンドのモジュール合成.
  • クロミウムイオンとサルフェンリガンドの複合.
  • リング開きポリメリゼーションおよび共ポリメリゼーション反応における触媒試験.
  • 触媒活動と材料の性質の分析.

主要な成果:

  • 異なるスペース長さのモノメリック・ジメリック・クロミウム・サルフェン複合体を合成しました.

さらに関連する動画

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
06:35

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates

Published on: February 15, 2016

Palladium N-Heterocyclic Carbene Complexes: Synthesis from Benzimidazolium Salts and Catalytic Activity in Carbon-carbon Bond-forming Reactions
19:58

Palladium N-Heterocyclic Carbene Complexes: Synthesis from Benzimidazolium Salts and Catalytic Activity in Carbon-carbon Bond-forming Reactions

Published on: July 30, 2017

関連する実験動画

Last Updated: Jun 8, 2026

Preparation of SNS Cobalt(II) Pincer Model Complexes of Liver Alcohol Dehydrogenase
06:31

Preparation of SNS Cobalt(II) Pincer Model Complexes of Liver Alcohol Dehydrogenase

Published on: March 19, 2020

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
06:35

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates

Published on: February 15, 2016

Palladium N-Heterocyclic Carbene Complexes: Synthesis from Benzimidazolium Salts and Catalytic Activity in Carbon-carbon Bond-forming Reactions
19:58

Palladium N-Heterocyclic Carbene Complexes: Synthesis from Benzimidazolium Salts and Catalytic Activity in Carbon-carbon Bond-forming Reactions

Published on: July 30, 2017

  • β-ブチロラクトンのポリメリゼーションと二分化後のCO(2) /プロピレン酸化物の共ポリメリゼーションの両方で,加強された触媒活性が実証されています.
  • 二機能触媒に起因する触媒性能の明確な改善が観察されました.

    • 結論:

    • ディメリックサルフェンクロミウム複合体は,モノメリック複合物と比較して優れた触媒活性を示します.
    • 二機能触媒は,生物分解性材料の生産効率を高める上で重要な役割を果たしています.
    • この研究は,持続可能なポリマー合成のための改良された触媒の設計のためのモジュラー戦略を提供します.