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Cycloaddition Reactions: Overview01:16

Cycloaddition Reactions: Overview

2.9K
Cycloadditions are one of the most valuable and effective synthesis routes to form cyclic compounds. These are concerted pericyclic reactions between two unsaturated compounds resulting in a cyclic product with two new σ bonds formed at the expense of π bonds. The [4 + 2] cycloaddition, known as the Diels–Alder reaction, is the most common. The other example is a [2 + 2] cycloaddition.
2.9K
[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

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

11.0K
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.
11.0K
Cycloaddition Reactions: MO Requirements for Thermal Activation01:16

Cycloaddition Reactions: MO Requirements for Thermal Activation

3.8K
Thermal cycloadditions are reactions where the source of activation energy needed to initiate the reaction is provided in the form of heat. A typical example of a thermally-allowed cycloaddition is the Diels–Alder reaction, which is a [4 + 2] cycloaddition. In contrast, a [2 + 2] cycloaddition is thermally forbidden.
3.8K
Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

2.0K
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
Diels–Alder Reaction Forming Cyclic Products: Stereochemistry01:28

Diels–Alder Reaction Forming Cyclic Products: Stereochemistry

4.2K
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.
4.2K
Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

2.3K
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...
2.3K

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分子間アルケネ-ダイエンの [2+2] サイクル添加および脱ポリマー化反応を可能にする触媒設計原理

Megan Mohadjer Beromi1, Jarod M Younker2, Hongyu Zhong1

  • 1Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States.

Journal of the American Chemical Society
|October 15, 2021
PubMed
まとめ

鉄とルテニウム触媒はアルケンとダイエンのサイクル添加を容易にし,リサイクル可能なビニルサイクロブタンを形成します. 触媒の設計,特にピンチャー・リガンド

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Facile Preparation of 2Z,4E-Dienamides by the Olefination of Electron-deficient Alkenes with Allyl Acetate
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Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene
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Facile Preparation of 2Z,4E-Dienamides by the Olefination of Electron-deficient Alkenes with Allyl Acetate
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Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene
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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:

  • ピリジン ((ダイミン)) 鉄複合体はアルケーンとダイエンの [2+2] サイクル添加を触媒化し,ビニルサイクロブタンを生成する.
  • これらの反応はまた,リサイクル可能なポリマーマイクロ構造であるディビニル (オリゴサイクロブタン) にブタディエンのオリゴメリゼーションを可能にします.

研究 の 目的:

  • サイクロアディションとオリゴメリゼーション反応におけるアリル置換ピリジン (ディイミン) 鉄とルテニウム複合体の触媒機構を調査する.
  • 先進的な触媒の設計とポリマー化学のリサイクルを促進するための構造-活性関係を明らかにする.

主な方法:

  • 鉄とルテニウムブタジエンの複合体の体系的な研究
  • 鉄ブタディーネ複合体の構造と計算分析
  • ラベル付け実験とメカニズム研究

主要な成果:

  • 触媒の硬さは,s-トランジエンの調整を促進し,酸化サイクルを容易にする.
  • サイクロブタンの形成は,可逆性C ((sp3) -C ((sp3)) の還元結合を持つメタラサイクルの中間物質を経由する.
  • 鉄複合体は,熱的条件下でC ((sp3) -C ((sp3)) の還元性除去のためにスピンクロスオーバー機構 (S=0からS=1) を利用する.
  • ルテニウム複合体は,同様の反応性のために,酸化還元素無害のピリジン ((ダイミン)) リガンドによる青光照射を必要とします.

結論:

  • ピリジン (ダイミン) 鉄触媒の構造的特徴は,ダイネの調整およびその後のサイクル添加に不可欠である.
  • 鉄触媒は,スピンクロスオーバーによる熱駆動C ((sp3) -C ((sp3)) 結合形成を可能にします.
  • ルテニウム触媒は,光による反応性を提供し,明確な活性化経路を強調します.
  • これらのメカニズムの理解は 次世代の触媒とポリマーの化学リサイクルのための設計原理を提供します.