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Radical Formation: Abstraction00:47

Radical Formation: Abstraction

3.6K
The electron of an atom can be abstracted from a compound by a relatively unstable radical to generate a new radical of relatively greater stability. For example, an initiator which forms radicals by homolysis can abstract a suitable species like a hydrogen atom or a halogen atom from a compound to generate a new radical. This ability of radicals to propagate by abstraction is a crucial feature of radical chain reactions.
Even though homolysis produces radicals, it is different from radical...
3.6K
Radical Anti-Markovnikov Addition to Alkenes: Thermodynamics01:32

Radical Anti-Markovnikov Addition to Alkenes: Thermodynamics

2.1K
The anti-Markovnikov addition of hydrogen halides to an alkene is thermodynamically feasible only with HBr. The radical addition reaction with other hydrogen halides like HCl and HI is thermodynamically unfavorable.
2.1K
Radical Formation: Homolysis00:54

Radical Formation: Homolysis

3.7K
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.
3.7K
Radical Anti-Markovnikov Addition to Alkenes: Mechanism01:17

Radical Anti-Markovnikov Addition to Alkenes: Mechanism

4.0K
The reaction of hydrogen bromide with alkenes in the presence of hydroperoxides or peroxides proceeds via anti-Markovnikov addition. The radical chain reaction comprises initiation, propagation, and termination steps.
The mechanism starts with chain initiation, which involves two steps. In the first chain initiation step, a weak peroxide bond is homolytically cleaved upon mild heating to form two alkoxy radicals. In the second initiation step, a hydrogen atom is abstracted by the alkoxy...
4.0K
Radical Reactivity: Intramolecular vs Intermolecular01:33

Radical Reactivity: Intramolecular vs Intermolecular

1.8K
Radical reactions can occur either intermolecularly or intramolecularly. In an intermolecular radical reaction, a nucleophilic radical adds to an electrophilic alkene or vice versa. In such reactions, the radical and generally the alkene, which is also called the radical trap, are two different molecules. Additionally, for such intermolecular reactions to occur, the radical trap must be active, present in an excess concentration, and the radical starting material must have a weak...
1.8K
Electrophilic 1,2- and 1,4-Addition of HX to 1,3-Butadiene01:17

Electrophilic 1,2- and 1,4-Addition of HX to 1,3-Butadiene

6.2K
The electrophilic addition of hydrogen halides such as HBr to alkenes and nonconjugated dienes gives a single product as per Markovnikov’s rule.
6.2K
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  3. 非対称性ダイメチルヒドラジンの理論的燃焼運動研究:c2h7n2の潜在エネルギー表面におけるh原子抽象と反応
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  3. 非対称性ダイメチルヒドラジンの理論的燃焼運動研究:c2h7n2の潜在エネルギー表面におけるh原子抽象と反応

関連する実験動画

Combustion Chemistry of Fuels: Quantitative Speciation Data Obtained from an Atmospheric High-temperature Flow Reactor with Coupled Molecular-beam Mass Spectrometer
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Combustion Chemistry of Fuels: Quantitative Speciation Data Obtained from an Atmospheric High-temperature Flow Reactor with Coupled Molecular-beam Mass Spectrometer

Published on: February 19, 2018

10.2K

非対称性ダイメチルヒドラジンの理論的燃焼運動研究:C2H7N2の潜在エネルギー表面におけるH原子抽象と反応

Xin Bai1,2, Xuan Ren1,2, Ruining He1,2

  • 1National Key Laboratory of Solid Propulsion, School of Astronautics, Northwestern Polytechnical University, Xi'an 710072, China.

The journal of physical chemistry. A
|September 4, 2025

PubMed で要約を見る

まとめ
この要約は機械生成です。

この研究では,非対称性ダイメチル水素 (UDMH) のロケット燃料の燃焼反応が詳細に示されています. 低温で特定のラジカルによる水素抽出は鍵であり,ロケットエンジンの設計に情報を与えます.

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Flame Experiments at the Advanced Light Source: New Insights into Soot Formation Processes

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Isolating Free Carbenes, their Mixed Dimers and Organic Radicals
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Isolating Free Carbenes, their Mixed Dimers and Organic Radicals

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Combustion Chemistry of Fuels: Quantitative Speciation Data Obtained from an Atmospheric High-temperature Flow Reactor with Coupled Molecular-beam Mass Spectrometer
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Combustion Chemistry of Fuels: Quantitative Speciation Data Obtained from an Atmospheric High-temperature Flow Reactor with Coupled Molecular-beam Mass Spectrometer

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Flame Experiments at the Advanced Light Source: New Insights into Soot Formation Processes
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Isolating Free Carbenes, their Mixed Dimers and Organic Radicals
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Isolating Free Carbenes, their Mixed Dimers and Organic Radicals

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科学分野:

  • 燃焼化学
  • 理論物理化学
  • 航空宇宙推進装置

背景:

  • 非対称性ダイメチル水素 (UDMH) は,様々な航空宇宙用途で使用される重要なハイパーゴリックロケット燃料です.
  • ロケットエンジンの性能と安全性を理解し,最適化するために,正確な燃焼運動機構は不可欠です.

研究 の 目的:

  • 基本的な反応を調査することによって,UDMHの詳細な燃焼運動機構を開発する.
  • UDMHラジカルの潜在エネルギー表面 (PES) を分析し,重要な反応経路を特定する.
  • 主要な種と反応の速度係数と熱化学的性質を計算する.

主な方法:

  • M06-2X/6-311++G ((d,p) とCCSD/cc-pVXZ (X=T,Q) を用いた高レベルの理論的計算.
  • 14つのH原子抽象 (HAA) 反応,4つの単分子反応,5つの化学活性化反応の分析.
  • UDMHラジカルPESに対する反応の圧力依存の評価

主要な成果:

  • ,H,CH3ラジカルによる水素抽出は,低温 (300〜700K) でUDMH燃焼を主導する.
  • N-N結合破裂とCH3NNH + ĊH3システムは,初期反応ネットワークにおいて有意であることが確認された.
  • 計算されたレート係数は,既存の実験的および理論的データと良好な一致を示しています.

結論:

  • 開発された運動メカニズムは,UDMHの燃焼過程に関する貴重な洞察を提供します.
  • この発見は,UDMH燃料を使用するロケットエンジンの設計と安全性の改善に不可欠です.
  • この研究は,UDMHの熱化学特性と反応運動に関する基本的なデータを提供する.