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相关概念视频

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
Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

2.9K
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.
2.9K
Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

3.6K
Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group...
3.6K
Five-Membered Heterocyclic Aromatic Compounds: Overview01:13

Five-Membered Heterocyclic Aromatic Compounds: Overview

5.2K
Heterocyclic aromatic compounds are cyclic compounds that are aromatic and have one or more heteroatoms—atoms other than carbon, in the ring. Depending upon the number of atoms present in the ring, they can be either five or six-membered. Examples of five-membered heterocyclic aromatic compounds include pyrrole, furan, thiophene, and imidazole. Pyrrole consists of one nitrogen atom having one lone pair of electrons. Furan and thiophene have one oxygen and one sulfur heteroatom,...
5.2K
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
Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry01:29

Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry

5.4K
Diels–Alder reactions between cyclic dienes locked in an s-cis configuration and dienophiles yield bridged bicyclic products.
5.4K

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相关实验视频

Updated: Jan 10, 2026

Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach
14:11

Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach

Published on: June 10, 2021

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皮雷尼桥梁的四乙烯:合成和光染色.

Elarbi Chatir1, Zakaria Ziani1,2, Martial Boggio-Pasqua3

  • 1Univ. Grenoble Alpes, CNRS, DCM, 38000 Grenoble, France.

The Journal of organic chemistry
|November 21, 2025
PubMed
概括

研究人员创造了新型的光色分子,其中包括烯核和滴乙烯基单元. 一个异构体显示可逆光异构化和可切换光用于光电子.

科学领域:

  • 有机化学 有机化学
  • 摄影化学的使用.
  • 材料科学 材料科学 材料科学

背景情况:

  • 光色材料对于先进的光学应用至关重要.
  • 狄氏乙烯 (DTE) 衍生物因其光色特性而受到广泛研究.
  • 基于Pyrene的化合物具有独特的光物理特性.

研究的目的:

  • 合成和描述新型的烯-DTE合物.
  • 为了研究体和其对光物理性质的影响.
  • 探索这些光活性分子的潜在光电子应用.

主要方法:

  • 烯-DTE联物的合成.
  • 隔离和特征的亚特罗皮索默.
  • 频谱分析 (UV-Vis,光) 进行.
  • 理论计算 (DFT). 理论计算 (DFT). 理论计算 (DFT). 理论计算 (DFT). 理论计算 (DFT). 理论计算 (DFT). 理论计算 (DFT). 理论计算 (DFT). 理论计算 (DFT). 理论计算 (DFT). 理论计算 (DFT). 理论计算 (DFT). 理论计算 (DFT). 理论计算 (DFT). 理论计算 (DFT). 理论计算 (DFT). 理论计算 (DFT.)

主要成果:

  • 成功分离了两个不同的形体.

更多相关视频

Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions
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Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions

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[DPEPhosbcpCu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst
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[DPEPhosbcpCu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst

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Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach
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Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach

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Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions
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Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions

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[DPEPhosbcpCu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst
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[DPEPhosbcpCu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst

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  • 一个基体表现出可逆的光异构和可切换的光.
  • 观察到异构体之间光物理性质的显著差异.
  • 对光色机制的阐明.

    • 结论:

    • 烯-DTE系统为设计具有可调节性质的光色材料提供了一个平台.
    • 在一个基体中可切换的光表明了光电子设备的潜力.
    • 了解结构-属性关系是未来分子设计的关键.