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[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

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

10.4K
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.
10.4K
Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation02:47

Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation

18.6K
Introduction
One of the convenient methods for the preparation of aldehydes and ketones is via hydration of alkynes. Hydroboration-oxidation of alkynes is an indirect hydration reaction in which an alkyne is treated with borane followed by oxidation with alkaline peroxide to form an enol that rapidly converts into an aldehyde or a ketone. Terminal alkynes form aldehydes, whereas internal alkynes give ketones as the final product.
18.6K
Phosphodiester Linkages01:01

Phosphodiester Linkages

101.6K
Overview
Phosphodiester bond forms when a phosphoric acid molecule (H3PO4) links with two hydroxyl groups (–OH) of two other molecules, forming two ester bonds. Two water molecules are released in this process. The phosphodiester bond is commonly found in nucleic acids (DNA and RNA) and plays a critical role in their structure and function.
Phosphodiester Bonds Link Nucleotides Together
DNA and RNA are polynucleotides or long chains of nucleotides that are linked together. A nucleotide is...
101.6K
Structural Isomerism02:34

Structural Isomerism

19.6K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
19.6K
Diels–Alder Reaction: Characteristics of Dienophiles01:24

Diels–Alder Reaction: Characteristics of Dienophiles

6.2K
In a Diels–Alder reaction, the diene is usually an electron-rich system and acts as a nucleophile, whereas the dienophile is electron-deficient and functions as an electrophile. Much like the diene, the nature of the dienophile significantly impacts the outcome of the reaction. 
Characteristics of Dienophiles
Generally, the best dienophiles are alkenes containing electron-withdrawing substituents such as carbonyl, nitrile, and nitro groups. The feasibility of a Diels–Alder reaction depends...
6.2K
Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide02:44

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

10.6K
Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
10.6K

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Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of Chain Transfer Polymerization
07:28

Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of Chain Transfer Polymerization

Published on: November 27, 2015

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イチレン・ディメリゼーションとオリゴメリゼーション

Fanji Kong1, Pablo Ríos2, Conner Hauck1

  • 1Department of Chemistry, University of Virginia, Charlottesville, Virginia 22904, United States.

Journal of the American Chemical Society
|December 21, 2022
PubMed
まとめ

新しいニッケル触媒は,エチレン二酸化と小分子化を促進し,貴重なブテンと高オレフィンを生成します. この研究は,オレフィン合成のための新しい協力的なニッケル-ボロン活性化メカニズムを明らかにしています.

さらに関連する動画

Mizoroki-Heck Cross-coupling Reactions Catalyzed by Dichloro{bis[1,1',1''-phosphinetriyltripiperidine]}palladium Under Mild Reaction Conditions
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Mizoroki-Heck Cross-coupling Reactions Catalyzed by Dichloro{bis[1,1',1''-phosphinetriyltripiperidine]}palladium Under Mild Reaction Conditions

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Controlled Photoredox Ring-Opening Polymerization of O-Carboxyanhydrides Mediated by Ni/Zn Complexes
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Controlled Photoredox Ring-Opening Polymerization of O-Carboxyanhydrides Mediated by Ni/Zn Complexes

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Mizoroki-Heck Cross-coupling Reactions Catalyzed by Dichloro{bis[1,1',1''-phosphinetriyltripiperidine]}palladium Under Mild Reaction Conditions
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Mizoroki-Heck Cross-coupling Reactions Catalyzed by Dichloro{bis[1,1',1''-phosphinetriyltripiperidine]}palladium Under Mild Reaction Conditions

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Controlled Photoredox Ring-Opening Polymerization of O-Carboxyanhydrides Mediated by Ni/Zn Complexes
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Controlled Photoredox Ring-Opening Polymerization of O-Carboxyanhydrides Mediated by Ni/Zn Complexes

Published on: November 21, 2017

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科学分野:

  • 有機金属化学
  • カタリシス
  • ポリマー科学

背景:

  • エチレン二酸化とオリゴメリゼーションは,貴重な化学物質を生産するための重要な産業プロセスです.
  • ニッケル触媒はオレフィン変換のために広く研究されているが,メカニズム的な理解と選択性の制御は依然として課題である.

研究 の 目的:

  • エチレン二酸化およびオリゴメリゼーションのためのビス・フォスフィノ・ボリル・サポートされたNi・II複合体の触媒活性を調査する.
  • これらの新しいニッケル触媒によってエチレン活性化と変換のメカニズムを解明する.

主な方法:

  • ビス・フォスフィノ・ボリル・サポートされたNi (II) 複合体の合成と特徴付け.
  • イチレン変換のためのアルキアルミニウムまたはメチルアルミノキサンの共触媒のNi (II) コンプレックスに対する触媒試験.
  • 反応経路を調査するための運動研究と機械学的調査.

主要な成果:

  • ビスフノボリルリガンドを含むNi (II) 複合体は,エチレン二酸化およびオリゴメリゼーションを効率的に触媒化する.
  • 1-ブテンの高い周回頻度と選択性は,特定の触媒前駆体を使用して達成されました.
  • エチレンオリゴメリゼーションにより,C4からC20までの製品が生成され,選択性は触媒構造によって影響を受けた.

結論:

  • エチレンの協力的なB/Ni活性化により,6基のボルメタラサイクルの中間物質が形成され,主要な触媒段階として提案されている.
  • Ni-Bユニットは,従来のNi水化物またはアルキル開始経路と区別して,触媒サイクルにおいて重要な役割を果たします.
  • これらの発見は,選択的オレフィン変換のための高度なニッケル触媒の設計に関する新しい洞察を提供します.