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関連する概念動画

Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

1.1K
In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
1.1K
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

3.8K
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...
3.8K
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

23.6K
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
23.6K
Catalysis02:50

Catalysis

29.9K
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.
29.9K
Halogenation of Alkenes02:46

Halogenation of Alkenes

18.2K
Halogenation is the addition of chlorine or bromine across the double bond in an alkene to yield a vicinal dihalide. The reaction occurs in the presence of inert and non-nucleophilic solvents, such as methylene chloride, chloroform, or carbon tetrachloride.
Consider the bromination of cyclopentene. Molecular bromine is polarized in the proximity of the π electrons of cyclopentene. An electrophilic bromine atom adds across the double bond, forming a cyclic bromonium ion intermediate.
18.2K
Introduction to Electrophilic Addition Reactions of Alkenes02:24

Introduction to Electrophilic Addition Reactions of Alkenes

10.0K
The double bond in a simple, unconjugated alkene is a region of high electron density that can act as a weak base or a nucleophile. The filled π orbital (HOMO) of the double bond can interact with the empty LUMO of an electrophile. A bonding interaction occurs when the electrophile attacks between the two carbons; the electrophile then accepts a pair of electrons from the π bond and undergoes addition across the double bond, yielding a single product.
Addition and elimination...
10.0K

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関連する実験動画

Updated: Dec 30, 2025

Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV
10:42

Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV

Published on: December 29, 2016

11.0K

ダブルカルコゲン-カルコゲン結合触媒

Wei Wang1, Haofu Zhu1, Lei Feng1

  • 1School of Chemistry and Chemical Engineering , Shandong University , Jinan 250100 , China.

Journal of the American Chemical Society
|January 22, 2020
PubMed
まとめ
この要約は機械生成です。

自然

さらに関連する動画

Catalytic Reactions at Amine-Stabilized and Ligand-Free Platinum Nanoparticles Supported on Titania During Hydrogenation of Alkenes and Aldehydes
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Catalytic Reactions at Amine-Stabilized and Ligand-Free Platinum Nanoparticles Supported on Titania During Hydrogenation of Alkenes and Aldehydes

Published on: June 24, 2022

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Preparation of SNS CobaltII Pincer Model Complexes of Liver Alcohol Dehydrogenase
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Preparation of SNS CobaltII Pincer Model Complexes of Liver Alcohol Dehydrogenase

Published on: March 19, 2020

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関連する実験動画

Last Updated: Dec 30, 2025

Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV
10:42

Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV

Published on: December 29, 2016

11.0K
Catalytic Reactions at Amine-Stabilized and Ligand-Free Platinum Nanoparticles Supported on Titania During Hydrogenation of Alkenes and Aldehydes
12:08

Catalytic Reactions at Amine-Stabilized and Ligand-Free Platinum Nanoparticles Supported on Titania During Hydrogenation of Alkenes and Aldehydes

Published on: June 24, 2022

3.9K
Preparation of SNS CobaltII Pincer Model Complexes of Liver Alcohol Dehydrogenase
06:31

Preparation of SNS CobaltII Pincer Model Complexes of Liver Alcohol Dehydrogenase

Published on: March 19, 2020

7.6K

科学分野:

  • 有機化学
  • 超分子化学
  • キャタリシス

背景:

  • 非共性S·O結合はタンパク質構造に影響する.
  • 化学反応に弱い非共振力を利用することは困難です.
  • 従来のラウハット・キュリア反応には 強いルイス基が必要である.

研究 の 目的:

  • ダブルカルコゲン-カルコゲン結合触媒の戦略を開発する.
  • 新しい触媒相互作用を用いたラウハート-キュリア型反応を可能にします.
  • 化学合成における地域選択性とより広い基質範囲を達成する.

主な方法:

  • ダブルカルコゲン-カルコゲン結合触媒戦略が設計された.
  • ドナー,エノン,アルコールの間で同時にSe·O結合相互作用が採用された.
  • 連続した二重Se·O結合触媒法が実施された.

主要な成果:

  • ダブルカルコゲン-カルコゲン結合戦略は,ラウハート-キュリア型反応を成功裏に促進しました.
  • この方法は,より反応性が低い,従来ではアクセス不可能な基板を用いて反応を可能にしました.
  • 地域選択性は,カルコゲン結合によるアルキル群の分化によって達成された.

結論:

  • ダブルカルコゲン-カルコゲン結合は有機合成のための新しい触媒的アプローチを提供します.
  • この戦略は,Rauhut-Currier反応の従来の方法の限界を克服します.
  • このアプローチは,弱い相互作用を使用して反応性と選択性を正確に制御することを示しています.