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Preparation and Reactions of Thiols02:33

Preparation and Reactions of Thiols

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Thiols are prepared using the hydrosulfide anion as a nucleophile in a nucleophilic substitution reaction with alkyl halides. For instance, bromobutane reacts with sodium hydrosulfide to give butanethiol.
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Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

Cycloaddition Reactions: MO Requirements for Photochemical Activation

2.3K
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.
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Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

2.0K
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
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Radical Formation: Homolysis00:54

Radical Formation: Homolysis

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A bond is formed between two atoms by sharing two electrons. When this bond is broken by supplying sufficient energy, either two electrons can be taken up by one atom forming ions by the cleavage called heterolysis, or the two electrons are shared by two atoms, with one each creating radicals by the cleavage called homolysis.
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Labeling DNA Probes03:31

Labeling DNA Probes

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DNA probes are fragments of DNA labeled with a reporter tag to enable their detection or purification. The resulting labeled DNA probes can then hybridize to target nucleic acid sequences through complementary base-pairing, and may be used to recover or identify these regions.
Radioisotopes, fluorophores, or small molecule binding partners like biotin or digoxigenin, are the most widely used reporter tags for labeling DNA probes. These labels can be attached to the probe DNA molecule via...
8.7K

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関連する実験動画

Updated: Nov 6, 2025

Constructing Thioether/Vinyl Sulfide-tethered Helical Peptides Via Photo-induced Thiol-ene/yne Hydrothiolation
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Constructing Thioether/Vinyl Sulfide-tethered Helical Peptides Via Photo-induced Thiol-ene/yne Hydrothiolation

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自己触媒化された可視光駆動型チオル結合

Leona L Rodrigues1,2, Aaron S Micallef1,2, Michael C Pfrunder1,2

  • 1Centre for Materials Science, Queensland University of Technology, 2 George Street, Brisbane, Queensland 4000, Australia.

Journal of the American Chemical Society
|May 6, 2021
PubMed
まとめ

新しい可視光誘導結合システムは,迅速なチオール-マイケルの添加のためにチオフェノールを生成します. この添加物なしで自己触媒化された方法は化学合成とポリマー改変を簡素化します.

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Chemoselective Modification of Viral Surfaces via Bioorthogonal Click Chemistry
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Chemoselective Modification of Viral Surfaces via Bioorthogonal Click Chemistry

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Facile Synthesis of Worm-like Micelles by Visible Light Mediated Dispersion Polymerization Using Photoredox Catalyst
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Facile Synthesis of Worm-like Micelles by Visible Light Mediated Dispersion Polymerization Using Photoredox Catalyst

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関連する実験動画

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Constructing Thioether/Vinyl Sulfide-tethered Helical Peptides Via Photo-induced Thiol-ene/yne Hydrothiolation
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Constructing Thioether/Vinyl Sulfide-tethered Helical Peptides Via Photo-induced Thiol-ene/yne Hydrothiolation

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Chemoselective Modification of Viral Surfaces via Bioorthogonal Click Chemistry
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Chemoselective Modification of Viral Surfaces via Bioorthogonal Click Chemistry

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Facile Synthesis of Worm-like Micelles by Visible Light Mediated Dispersion Polymerization Using Photoredox Catalyst
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Facile Synthesis of Worm-like Micelles by Visible Light Mediated Dispersion Polymerization Using Photoredox Catalyst

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科学分野:

  • 有機化学
  • 写真化学
  • ポリマー化学

背景:

  • 従来の光誘発型チオールエネ/イネ反応には,しばしば光ケージ塩基,オルガノ光触媒,またはラジカル光誘発剤などの添加物が必要である.
  • これらの添加物は反応条件と浄化プロセスを複雑にすることができます.

研究 の 目的:

  • 可視光で誘発される高効率の添加物のない結合システムを開発する.
  • 反応性チオフェノールを生成するための新しい光誘導再配列を活用する.
  • ポリマー末端群の改変におけるシステムの有用性を実証する.

主な方法:

  • チオフェノールを生成する *o*-チオピリニジルベンザルデヒド (*o*TPyB) の可視光誘発による再配置.
  • ピリジン媒介による光生成チオフェノールの自己触媒結合.
  • その後,電子欠乏性アルキン/アルケンを添加した添加物のないチオールミハエル.

主要な成果:

  • この研究では,初めて光誘発による*o*TPyBの再配置について説明しています.
  • 外部添加物がなくても,結合システムは効率的に動作します.
  • ポリマー末端グループ改変は,優れた末端グループ忠誠度で成功しました.

結論:

  • 開発された可視光誘導システムは,チオールミハエル添加物の効率的で添加物のないアプローチを提供します.
  • この方法は合成手順を簡素化し,ポリマー機能化に適用できます.
  • 自己触媒化と可視光活性化により 化学結合の代替手段として より環境にやさしいものとなる.