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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

2.6K
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.
2.6K
π Electron Effects on Chemical Shift: Aromatic and Antiaromatic Compounds01:14

π Electron Effects on Chemical Shift: Aromatic and Antiaromatic Compounds

1.2K
In aromatic compounds, such as benzene, the circulation of (4n + 2) π-electrons sets up a diamagnetic or diatropic ring current around the perimeter of the molecule. This current induces a magnetic field that opposes the external field inside the ring and reinforces it on the outside. The protons in benzene are deshielded and exhibit high chemical shifts in the range 6.5–8.5 ppm. The shielding effect at the center of the ring is evident in complex aromatic molecules, such as...
1.2K
Thermal Sigmatropic Reactions: Overview01:16

Thermal Sigmatropic Reactions: Overview

2.1K
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...
2.1K
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
Nucleophilic Aromatic Substitution: Addition–Elimination (SNAr)01:30

Nucleophilic Aromatic Substitution: Addition–Elimination (SNAr)

3.7K
Nucleophilic substitution in aromatic compounds is feasible in substrates bearing strong electron-withdrawing substituents positioned ortho or para to the leaving group. The reaction proceeds via two steps: the addition of the nucleophile and the elimination of the leaving group.
The reaction begins with an attack of the nucleophile on the carbon that holds the leaving group. This results in the delocalization of the π electrons over the ring carbons. The resonance interaction between...
3.7K
¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

1.7K
The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
1.7K

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Updated: Jun 8, 2025

An Optimized Protocol for Electrophoretic Mobility Shift Assay Using Infrared Fluorescent Dye-labeled Oligonucleotides
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能量转移启用了1,4-阿里尔迁移.

Shu-Ya Wen1, Jun-Jie Chen1, Yu Zheng1

  • 1School of Physical Science and Technology, ShanghaiTech University, 393 Middle Huaxia Road, Pudong, 201210 Shanghai, China.

Angewandte Chemie (International ed. in English)
|November 5, 2024
PubMed
概括
此摘要是机器生成的。

这项研究在可见光下引入了一种新的能量转移催化1,4-化反应,使功能组转移成为可能. 这种方法促进了aryl迁移,并显示了药物修饰的潜力.

关键词:
阿里尔迁移的迁移能量转移催化剂的作用功能组的转移 功能组的转移一个激进的激进主义者.调整的重新安排

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A Simple Migration/Invasion Workflow Using an Automated Live-cell Imager
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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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Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene

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相关实验视频

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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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科学领域:

  • 有机化学 有机化学
  • 合成化学 合成化学
  • 光催化作用的光催化

背景情况:

  • 通过电子转移的1,2-aryl和1,4-aryl基的迁移是成熟的合成转换.
  • 之前没有报道过能转移启用的1,4-arylation.

研究的目的:

  • 开发一种使用能量转移催化剂进行1,4-arylation的新型合成方法.
  • 在可见光条件下探索这种新反应的范围和局限性.

主要方法:

  • 可见光光催化与能量转移机制.
  • 对于1,4-aryl迁移的二-π-乙重新排列.
  • 功能组耐受性和基质范围的研究.

主要成果:

  • 实现了前所未有的二-π-乙重新排列,其中包括由能量转移催化剂促进的1,4-aryl迁移.
  • 该协议是温和的,可以容忍广泛的功能组和芳香环.
  • 证明了在修改几个药物分子中的成功应用.

结论:

  • 在可见光下开发了一种新的,强大的,多功能方法,用于在可见光下进行1,4-arylation.
  • 反应是通过一种涉及能量转移的激进机制进行的.
  • 该方法在合成有机化学和药物发现方面具有重大潜力.