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関連する概念動画

Cycloaddition Reactions: MO Requirements for Thermal Activation01:16

Cycloaddition Reactions: MO Requirements for Thermal Activation

3.7K
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.
3.7K
Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

Cycloaddition Reactions: MO Requirements for Photochemical Activation

2.2K
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.
2.2K
Cycloaddition Reactions: Overview01:16

Cycloaddition Reactions: Overview

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

Photochemical Electrocyclic Reactions: Stereochemistry

1.9K
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
1.9K
[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

10.8K
The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
10.8K
Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

2.5K
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.
2.5K

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Design, Synthesis, and Photochemical Properties of Clickable Caged Compounds
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Design, Synthesis, and Photochemical Properties of Clickable Caged Compounds

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効率的で選択的なクロス[2 + 2]サイクロディションのための可視光反応性八面体ケージ

Rikuya Tanaka1, Hiroki Takezawa1, Makoto Fujita2,3

  • 1Department of Applied Chemistry, School of Engineering, The University of Tokyo, Mitsui Link Lab Kashiwanoha 1, FS CREATION, 6-6-2 Kashiwanoha, Kashiwa, Chiba 277-0882, Japan.

Journal of the American Chemical Society
|July 15, 2025
PubMed
まとめ

研究者は可視光に反応するケージを開発し フォト反応を強めた. このケージは,可視光を使用した無活性基質の選択的なクロス[2 + 2]サイクル添加を可能にする.

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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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[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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Design, Synthesis, and Photochemical Properties of Clickable Caged Compounds

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

  • 超分子化学
  • 写真化学
  • 材料科学

背景:

  • ホスト-ゲスト複合は,基板を閉じ込めることで光反応の選択性に影響する.
  • 以前の宿主には可視光吸収が欠けていて,UV吸収反応剤が必要でした.
  • 標準的なM6L4のケージは 効果的な宿主だが,光活性がない.

研究 の 目的:

  • 光反応のための可視光対応M6L4ケージを設計する.
  • 可視光による無活性基質のサイクル添加を可能にします.
  • 閉じ込めによる光反応で高いステレオと場所選択性を達成する.

主な方法:

  • 可視光に反応するM6L4八面体ケージの開発.
  • 光活性サイクロメタラテッドPt (II) ユニットをケージの頂点に組み込む.
  • 可視光誘導のクロス[2 + 2]サイクロアディションのためにケージを使用する.

主要な成果:

  • 新しいケージは可視光に反応しながら 封じ込め能力を維持しています
  • 非活性基質の効率的な可視光誘導クロス[2 + 2]サイクル添加が達成された.
  • 完璧なステレオと場所の選択性は,基板の閉じ込めにより実証されました.
  • M6L4ケージでは初めて,触媒選択的クロス[2 + 2]サイクロアディションが達成された.

結論:

  • 可視光に反応するM6L4のケージは,高い選択性を持つ光反応を誘導することができる.
  • 光活性型Pt (II) ユニットは前例のない可視光による変換を可能にします.
  • このアプローチは,光化学と触媒の宿主-ゲスト化学の範囲を拡大します.