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相关概念视频

Conjugate Addition of Enolates: Michael Addition01:08

Conjugate Addition of Enolates: Michael Addition

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The attack of a nucleophile at the β carbon of an α,β-unsaturated carbonyl compound is called conjugate addition. Conjugate addition reactions of active methylene compounds, such as β-diketones, β-keto esters, β-keto nitriles, and α-nitro ketones, are called Michael addition reactions.
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Cyclohexenones via Michael Addition and Aldol Condensation: The Robinson Annulation01:27

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Robinson annulation is a base-catalyzed reaction for the synthesis of 2-cyclohexenone derivatives from 1,3-dicarbonyl donors (such as cyclic diketones, β-ketoesters, or β-diketones) and α,β-unsaturated carbonyl acceptors. Named after Sir Robert Robinson, who discovered it, this reaction yields a six-membered ring with three new C–C bonds (two σ bonds and one π bond).
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Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)

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Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
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Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

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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...
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Radical Anti-Markovnikov Addition to Alkenes: Mechanism01:17

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The reaction of hydrogen bromide with alkenes in the presence of hydroperoxides or peroxides proceeds via anti-Markovnikov addition. The radical chain reaction comprises initiation, propagation, and termination steps.
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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

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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...
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Updated: Jun 23, 2025

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迈克尔的添加-消除环开放聚合

Yong-Liang Su1, Wei Xiong1, Liang Yue2

  • 1School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332, United States.

Journal of the American Chemical Society
|June 21, 2024
PubMed
概括
此摘要是机器生成的。

这项研究引入了一种新型的循环氨酸系统,用于使用可逆迈克尔加除机制进行受控的环开放聚合. 这一突破使得可调节的高质量聚合物合成成为可能,

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科学领域:

  • 聚合物化学
  • 有机合成
  • 材料科学

背景情况:

  • 环开聚合 (ROP) 是一种多用途的聚合物合成方法.
  • 开发具有动态可逆性的受控ROP方法仍然是一个挑战.
  • 循环氨酸具有作为单体的潜力,但需要创新的聚合策略.

研究的目的:

  • 开发一种用于控制环开放聚合的新型循环烯系统.
  • 将可逆迈克尔添加-消除 (MAE) 机制纳入ROP.
  • 研究具有可调节性质和可控制分子重量的聚乙烯的合成.

主要方法:

  • 新型循环单体的合成.
  • 使用可逆迈克尔添加-消除 (MAE) 机制的环开聚合 (ROP).
  • 聚合物的特性,包括分子量,分散性,光学透明度和机械强度.
  • 密度函数理论 (DFT) 计算以阐明聚合机制.

主要成果:

  • 通过MAE成功开发了循环烯单体,使其能够控制ROP.
  • 实现了温和的聚合条件,可调节的功能性,受控的分子重量 (Mn) 和狭窄的分散性.
  • 合成的聚乙烯具有良好的光学透明度和良好的机械性能.
  • 通过脱聚合证明了单体的恢复.
  • DFT 计算提供了关于铁 (TP) 和铁 (TC) 系统之间的单体构成和反应性差异的见解.

结论:

  • 对于受控的环开放聚合,MAE机制是可行的.
  • 开发的战略为合成功能性聚烯提供了新的途径.
  • 这些发现为未来可控ROP的单体设计提供了指导方针.