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関連する概念動画

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

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

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

Cycloaddition Reactions: MO Requirements for Thermal Activation

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.
Radical Reactivity: Intramolecular vs Intermolecular01:33

Radical Reactivity: Intramolecular vs Intermolecular

Radical reactions can occur either intermolecularly or intramolecularly. In an intermolecular radical reaction, a nucleophilic radical adds to an electrophilic alkene or vice versa. In such reactions, the radical and generally the alkene, which is also called the radical trap, are two different molecules. Additionally, for such intermolecular reactions to occur, the radical trap must be active, present in an excess concentration, and the radical starting material must have a weak carbon–halogen...
Pericyclic Reactions: Introduction01:17

Pericyclic Reactions: Introduction

Pericyclic reactions are organic reactions that occur via a concerted mechanism without generating any intermediates. The reactions proceed through the movement of electrons in a closed loop to form a cyclic transition state, where rearrangement of the σ and π bonds yields specific products.
Pericyclic reactions can be classified into three categories: electrocyclic reactions, cycloaddition reactions, and sigmatropic rearrangements. Electrocyclic reactions and sigmatropic rearrangements are...
Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

Cycloaddition Reactions: MO Requirements for Photochemical Activation

Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
Predicting Reaction Outcomes02:24

Predicting Reaction Outcomes

Kinetics describes the rate and path by which a reaction occurs. In contrast, thermodynamics deals with state functions and describes the properties, behavior, and components of a system. It is not concerned with the path taken by the process and cannot address the rate at which a reaction occurs. Although it does provide information about what can happen during a reaction process, it does not describe the detailed steps of what appears on an atomic or a molecular level. On the other hand,...

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Updated: Jun 25, 2026

Utilization of Stop-flow Micro-tubing Reactors for the Development of Organic Transformations
13:09

Utilization of Stop-flow Micro-tubing Reactors for the Development of Organic Transformations

Published on: January 4, 2018

効率的な運動マクロサイクリング.

Wen Feng1, Kazuhiro Yamato, Liuqing Yang

  • 1College of Chemistry, Key Laboratory for Radiation Physics and Technology of Ministry of Education, and Institute of Nuclear Science and Technology, Sichuan University, Chengdu, 610064, Sichuan, China.

Journal of the American Chemical Society
|February 5, 2009
PubMed
まとめ
この要約は機械生成です。

研究者は,大きな芳香性オリゴアミドマクロサイクルを非常に効率的に合成することができました. 先駆体折り畳みとステリック効果は,これらの運動マクロサイクライゼーション反応の高収率を説明し,大きく形状が持続する構造を生成します.

さらに関連する動画

Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by &#960;-&#960; Stacking Interactions
10:53

Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by π-π Stacking Interactions

Published on: October 10, 2016

A Microwave-Assisted Direct Heteroarylation of Ketones Using Transition Metal Catalysis
07:06

A Microwave-Assisted Direct Heteroarylation of Ketones Using Transition Metal Catalysis

Published on: February 16, 2020

関連する実験動画

Last Updated: Jun 25, 2026

Utilization of Stop-flow Micro-tubing Reactors for the Development of Organic Transformations
13:09

Utilization of Stop-flow Micro-tubing Reactors for the Development of Organic Transformations

Published on: January 4, 2018

Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by &#960;-&#960; Stacking Interactions
10:53

Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by π-π Stacking Interactions

Published on: October 10, 2016

A Microwave-Assisted Direct Heteroarylation of Ketones Using Transition Metal Catalysis
07:06

A Microwave-Assisted Direct Heteroarylation of Ketones Using Transition Metal Catalysis

Published on: February 16, 2020

科学分野:

  • 超分子化学 超分子化学
  • オーガニック・シンセシス オーガニック・シンセシス
  • 材料科学 材料科学とは

背景:

  • 運動制御されたマクロサイクライゼーション反応は,通常,劣った結果をもたらします.
  • 脊椎硬化オリゴアミドは,よく定義された形状を採用することができます.
  • 以前の研究で,オリゴアミドが半月形を形成していることが示されていた.

研究 の 目的:

  • 芳香性オリゴアミドマクロサイクルの高効率的形成を調査する.
  • 予期せぬ高収率の背後にあるメカニズムを理解する.
  • 重要な内部空洞を持つ大きなマクロサイクルを合成する.

主な方法:

  • 6つのメタリンクされた残基を持つ芳香性オリゴアミドマクロサイクルの合成.
  • オリゴアミド前駆体の運動シミュレーションと実験的結合.
  • メタダイアミンとパラダイアシド塩化物を用いた1段階の多成分マクロサイクリング反応.

主要な成果:

  • 高収量で形成されるマクロサイクルは,運動シミュレーションから逸脱する.
  • 先駆者の折りたたみと遠隔ステリック効果は,重要な要因として特定されました.
  • 最大2.9nmの空洞を持つ大型マクロサイクル (70〜90の構成環) が効率的に合成されました (>80%の収量).

結論:

  • この研究は,希少で高度に効率的な運動マクロサイクライゼーションシステムを提示しています.
  • 先駆体構成とステリック効果は,効率的なマクロサイクル形成に不可欠です.
  • この方法は,潜在的な応用を持つ,形状が恒常的な大きなマクロサイクルを生成します.