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相关概念视频

Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

Cycloaddition Reactions: MO Requirements for Photochemical Activation

2.6K
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.
2.6K
Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

2.2K
The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
2.2K
Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

8.9K
Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
8.9K
Cycloaddition Reactions: MO Requirements for Thermal Activation01:16

Cycloaddition Reactions: MO Requirements for Thermal Activation

4.2K
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.
4.2K
Cycloaddition Reactions: Overview01:16

Cycloaddition Reactions: Overview

3.3K
Cycloadditions are one of the most valuable and effective synthesis routes to form cyclic compounds. These are concerted pericyclic reactions between two unsaturated compounds resulting in a cyclic product with two new σ bonds formed at the expense of π bonds. The [4 + 2] cycloaddition, known as the Diels–Alder reaction, is the most common. The other example is a [2 + 2] cycloaddition.
3.3K
Thermal Electrocyclic Reactions: Stereochemistry01:17

Thermal Electrocyclic Reactions: Stereochemistry

2.5K
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.
2.5K

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Versatile CO2 Transformations into Complex Products: A One-pot Two-step Strategy
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Versatile CO2 Transformations into Complex Products: A One-pot Two-step Strategy

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一种用于CH激活逆合成的图形对序列方法.

Ruixin Li1, Qianlong Li1, Xiaojie Zhang2

  • 1School of Artificial Intelligence, Hebei University of Technology, Tian Jin 300401, China.

Journal of chemical information and modeling
|November 8, 2025
PubMed
概括

这项研究介绍了TransGraphEdit,这是一个新的AI框架,用于预测涉及C-H激活的化学反应. 它通过建模分子图的编辑来增强反合成,改善复杂有机合成的预测.

科学领域:

  • 有机化学 有机化学
  • 计算化学计算化学
  • 人工智能的人工智能

背景情况:

  • 在有机合成中,C-H激活反应至关重要,但由于C-H键惰性和区域选择性问题,对逆合成具有挑战性.
  • 现有的计算模型难以识别C-H激活系统中的反应部位,并预测C-H激活系统中断路径.

研究的目的:

  • 开发一种新的,无模板的框架,用于预测C-H激活反应的逆合成.
  • 通过建模分子图形编辑来提高回复合成预测的准确性和可解释性.

主要方法:

  • 提出了TransGraphEdit,这是一个结合图形神经网络 (GNN) 编码器和变压器解码器的框架.
  • 基于产品的分子图形建模的逐步结构编辑.
  • 采用了SMILES增强策略,以提高低资源C-H激活反应的概括性.

主要成果:

  • TransGraphEdit有效地捕捉了功能组之间的远程依赖关系和协同效应.
  • 在C-H Arylation数据集上达到58.06%的Top-1准确度,在USPTO-50K上达到53.8%.
  • 在回复合成预测中证明了强度和域适应性.

结论:

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  • TransGraphEdit提供了一种可解释和机制意识的方法来对C-H激活逆合成.
  • 该框架显示了推进计算有机合成和反应预测的重大前景.