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相关概念视频

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

2.0K
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...
2.0K
Base-Catalyzed Ring-Opening of Epoxides02:26

Base-Catalyzed Ring-Opening of Epoxides

8.3K
Due to their highly strained structures, epoxides can readily undergo ring-opening reactions through nucleophilic substitution, either in the presence of an acid or a base. The nucleophilic substitution reactions in the presence of acid are called acid-catalyzed ring-opening reactions, and nucleophilic substitution reactions in the presence of a base are called base-catalyzed ring-opening reactions. Epoxides undergo base-catalyzed ring-opening reactions in the presence of a strong nucleophile...
8.3K
Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

1.9K
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...
1.9K
Acid-Catalyzed Ring-Opening of Epoxides02:24

Acid-Catalyzed Ring-Opening of Epoxides

7.1K
Epoxides that are three-membered ring systems are more reactive than other cyclic and acyclic ethers. The high reactivity of epoxides originates from the strain present in the ring. This ring strain acts as a driving force for epoxides to undergo ring-opening reactions either with halogen acids or weak nucleophiles in the presence of mild acid. The acid catalyst converts the epoxide oxygen, a poor leaving group, into an oxonium ion, a better leaving group, making the reaction feasible. The...
7.1K
Thermal Electrocyclic Reactions: Stereochemistry01:17

Thermal Electrocyclic Reactions: Stereochemistry

2.0K
The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
2.0K

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Updated: Jun 5, 2025

Photogeneration of N-Heterocyclic Carbenes: Application in Photoinduced Ring-Opening Metathesis Polymerization
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芳香环开放的转化

Valeriia Hutskalova1, Christof Sparr2

  • 1Department of Chemistry, University of Basel, Basel, Switzerland.

Nature
|December 11, 2024
PubMed
概括
此摘要是机器生成的。

研究人员开发了芳香环开放转化 (ArROM) 来破裂稳定的芳香碳-碳键. 这种新型的催化方法有效地转化各种芳香化合物,而不需要额外的试剂或光.

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Preparation of Contiguous Bisaziridines for Regioselective Ring-Opening Reactions
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科学领域:

  • 有机化学
  • 催化剂
  • 材料科学

背景情况:

  • 芳香化合物在化学和材料科学中非常重要,因为它们的稳定性和定义结构.
  • 由于破坏芳香度的能量成本,裂解惰性芳香碳-碳键具有挑战性.
  • 基转化是非芳香系统的强大工具,但它对芳香物的应用仍然难以捉摸.

研究的目的:

  • 开发一种用于分解芳香碳-碳键的催化方法.
  • 探索转化反应对芳香环系统的应用.
  • 调查芳香物的立体选择性转化潜力.

主要方法:

  • 使用了Schrock-Hoveyda催化剂进行芳香环开放转化 (ArROM).
  • 将ArROM应用于各种芳香环系统,包括四烯,烯,醇,氨酸和氨酸.
  • 分析了在反应过程中形成的独特基中间体.

主要成果:

  • 已经成功地证明了ArROM用于各种芳香化合物的分裂.
  • 确定了每个芳香环系统的独特基中间体.
  • 实现了立体选择性ArROM,显示了对体配置的催化剂控制.

结论:

  • ArROM提供了一种可行的和高效的催化方法来转化芳香化合物.
  • 这种方法可以在不需要额外的试剂或光刺激的情况下进行各种芳香物的相互转换.
  • 这种发展为操纵和功能化芳香结构开辟了新的途径.