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関連する概念動画

Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

2.8K
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.
2.8K
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
Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

2.1K
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
2.1K
Stability of Substituted Cyclohexanes02:30

Stability of Substituted Cyclohexanes

14.5K
This lesson discusses the stability of substituted cyclohexanes with a focus on energies of various conformers and the effect of 1,3-diaxial interactions.
The two chair conformations of cyclohexanes undergo rapid interconversion at room temperature. Both forms have identical energies and stabilities, each comprising equal amounts of the equilibrium mixture. Replacing a hydrogen atom with a functional group makes the two conformations energetically non-equivalent.
For example, in...
14.5K
Woodward–Hoffmann Selection Rules and Microscopic Reversibility01:34

Woodward–Hoffmann Selection Rules and Microscopic Reversibility

3.7K
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...
3.7K
Pericyclic Reactions: Introduction01:17

Pericyclic Reactions: Introduction

9.5K
Pericyclic reactions are organic reactions that occur via a concerted mechanism without generating any intermediates. The reactions proceed through the movement of electrons in a closed loop to form a cyclic transition state, where rearrangement of the σ and π bonds yields specific products.
Pericyclic reactions can be classified into three categories: electrocyclic reactions, cycloaddition reactions, and sigmatropic rearrangements. Electrocyclic reactions and sigmatropic...
9.5K

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関連する実験動画

Updated: Dec 25, 2025

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

Published on: July 17, 2020

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サイクロファンが持続する超安定性ポルフィリン

Wenqi Liu1, Chenjian Lin1, Jacob A Weber1

  • 1Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States.

Journal of the American Chemical Society
|April 4, 2020
PubMed
まとめ

この研究では,サイクロファンの受容体内にポルフィリンを封じ込み,高度な結合親和度を達成し,高度な材料の用途のためにその光学特性と化学的安定性を大幅に向上させました.

さらに関連する動画

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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Synthesis and Characterization of Multi-Modal Phase-Change Porphyrin Droplets
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Synthesis and Characterization of Multi-Modal Phase-Change Porphyrin Droplets

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関連する実験動画

Last Updated: Dec 25, 2025

Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions
07:12

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

Published on: July 17, 2020

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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

Published on: June 10, 2021

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Synthesis and Characterization of Multi-Modal Phase-Change Porphyrin Droplets
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Synthesis and Characterization of Multi-Modal Phase-Change Porphyrin Droplets

Published on: October 15, 2021

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科学分野:

  • 超分子化学
  • 材料科学
  • 写真化学

背景:

  • ポルフィリンは,触媒と光医学の応用を持つ重要な染色体である.
  • 水中のポルフィリンの集積と安定性を制御することは依然として課題です.

研究 の 目的:

  • 水中のポルフィリンを封じ込めるサイクロファンの受容体を開発する.
  • ポルフィリンの光物理的性質と化学的安定性に対する封じ込めの影響を調査する.

主な方法:

  • 三環サイクロファンの受容体の合成
  • 水中の受容体との自由塩基および亜鉛ポルフィリンの結合研究.
  • カプセル化されたポルフィリンのスペクトル解析 (吸収,放出)
  • 厳しい条件下での化学的安定性の評価 (酸性,D/H交換)

主要な成果:

  • 水中のポルフィリン封入で達成された亜ナノモラー結合親和性.
  • 受容体の三循環構造による2つの共構成同位体を発見した.
  • 光量子力学と赤色移転光学特性の 顕著な改善
  • 前例のない化学的安定性で D/H交換,陽子化,溶解を阻害する

結論:

  • 三環サイクロファンはポーフィリンを効果的に封じ込み,その性質を調節する.
  • カプセル化により,光物理的特性が向上し,特殊な化学的惰性が生じる.
  • 先進的な材料,人工光合成,そして生物医学機器の潜在的応用.