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相关概念视频

[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement01:21

[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement

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The Cope rearrangement is classified as a [3,3] sigmatropic shift in 1,5-dienes, leading to a more stable, isomeric 1,5-diene. The reaction involves a concerted movement of six electrons, four from two π bonds and two from a σ bond, via an energetically favorable chair-like transition state.
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Thermal Sigmatropic Reactions: Overview01:16

Thermal Sigmatropic Reactions: Overview

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Sigmatropic rearrangements are a class of pericyclic reactions in which a σ bond migrates from one part of a π system to another. These are intramolecular rearrangements where the total number of σ and π bonds remain unchanged.
Sigmatropic shifts are classified based on an order term [i, j ], where i and j indicate the number of atoms across which each end of the σ bond migrates. Below are examples of a [3,3] sigmatropic shift in 1,5-hexadiene, referred...
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Colors and Magnetism03:02

Colors and Magnetism

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Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
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Woodward–Hoffmann Selection Rules and Microscopic Reversibility01:34

Woodward–Hoffmann Selection Rules and Microscopic Reversibility

4.1K
Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...
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Thermal and Photochemical Electrocyclic Reactions: Overview01:26

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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
3.1K
Thermal Electrocyclic Reactions: Stereochemistry01:17

Thermal Electrocyclic Reactions: Stereochemistry

2.6K
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.
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在conocene-hexapentaene复合体中可逆的哈普托热转移.

Noriyuki Suzuki1, Daisuke Hashizume, Hajime Yoshida

  • 1Advanced Technology Support Division, RIKEN Advanced Science Institute, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan.

Journal of the American Chemical Society
|November 5, 2008
PubMed
概括

低价值的conocene复合物与hexapentaenes反应,形成conacyclopentynes和eta2-pi-协调复合物. 观察到这些物种之间的相互转换和拟议的异化物插入机制.

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科学领域:

  • 有机金属化学 有机金属化学
  • 化学化学 化学
  • 有机合成 有机合成

背景情况:

  • 低价值的conocene复合物是有机合成中的多功能试剂.
  • 六烯是独特的不和碳化合物,具有多种反应的潜力.
  • 了解和聚烯的协调化学是开发新合成方法的关键.

研究的目的:

  • 为了研究低价值齐尔科诺物种与1,1,6,6-四基-1,2,3,4,5-六烯的反应.
  • 描述由此产生的有机合物复合物,并探索它们的相互转换.
  • 阐明将异化物插入到子cyclopentynes中的机制.

主要方法:

  • 低价值齐尔科诺复合物的与四基-六丁烯的反应.
  • 形成的复合物的光谱表征 (NMR,X射线晶体学).
  • 机理学研究,包括对哈普托热交互转换和拟议的中间体的观察.

主要成果:

  • 形成1-环环-3-和eta2-pi-coordinated复合体,依赖基团和连接体.
  • 观测两种类型的conocene复合体之间的 haptotropic 相互转换.
  • 提出了一种涉及eta2-pi复合物中间体的双异化物插入机制.

结论:

  • 低价值齐尔科诺与六丁的反应产生了不同的有机齐尔科尼物种.
  • 哈普托罗普重组在这些复合体的相互转换中起着关键作用.
  • 已提出将异化物插入到子cyclopentynes的一个合理的机制,突出了eta2-pi-complex中间体的作用.