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相关概念视频

Radical Autoxidation01:20

Radical Autoxidation

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The oxidation of an organic compound in the presence of air or oxygen is called autoxidation. For example, cumene reacts with oxygen to form hydroperoxide. Autoxidation involves initiation, propagation, and termination steps. Many organic compounds are susceptible to autoxidation—especially ethers in the presence of oxygen, which form hydroperoxides. Even though this reaction is slow, old ether bottles contain small amounts of peroxide, which leads to laboratory explosions during ether...
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Oxidation Numbers03:14

Oxidation Numbers

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In redox reactions, the transfer of electrons occurs between reacting species. Electron transfer is described by a hypothetical number called the oxidation number (or oxidation state). It represents the effective charge of an atom or element, which is assigned using a set of rules.
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Oxidation and Reduction of Organic Molecules01:19

Oxidation and Reduction of Organic Molecules

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Energy production within a cell involves many coordinated chemical pathways. Most of these pathways are combinations of oxidation and reduction reactions, which occur at the same time. An oxidation reaction strips an electron from an atom in a compound, and the addition of this electron to another compound is a reduction reaction. Because oxidation and reduction usually occur together, these pairs of reactions are called redox reactions.
The removal of an electron from a molecule, results in a...
7.1K
Oxidation of Phenols to Quinones01:17

Oxidation of Phenols to Quinones

3.4K
In the presence of oxidizing agents, phenols are oxidized to quinones. Quinones can be easily reduced back to phenols using mild reducing agents. The electron-donating hydroxyl group enhances the reactivity of the aromatic ring, enabling oxidation of the ring even in the absence of an α hydrogen.
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox...
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Oxidation-Reduction Reactions03:11

Oxidation-Reduction Reactions

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Oxidation–Reduction Reactions
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Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate02:21

Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate

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Alkenes can be dihydroxylated using potassium permanganate.  The method encompasses the reaction of an alkene with a cold, dilute solution of potassium permanganate under basic conditions to form a cis-diol along with a brown precipitate of manganese dioxide.
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Original Experimental Approach for Assessing Transport Fuel Stability
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人类的氧化场

Nora Zannoni1, Pascale S J Lakey2, Youngbo Won3

  • 1Atmospheric Chemistry Department, Max Planck Institute for Chemistry, Mainz, Germany.

Science (New York, N.Y.)
|September 1, 2022
PubMed
概括
此摘要是机器生成的。

暴露在臭氧中的人体皮肤会产生高度的基 (OH),形成室内氧化场. 这一发现影响了室内空气质量和人类健康.

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科学领域:

  • 环境化学
  • 大气化学
  • 室内空气质量

背景情况:

  • 基 (OH) 是大气污染物的关键氧化剂.
  • 之前的研究还没有完全描述人为的室内OH基生成.
  • 臭氧暴露在室内环境中很常见.

研究的目的:

  • 研究人类暴露在臭氧中的OH激素的产生.
  • 量化OH基的度并了解它们的形成机制.
  • 模拟人为OH场的空间范围和影响因素.

主要方法:

  • 控制气候室实验使人类暴露在臭氧中.
  • 测量OH的总反应性,和氧化产物.
  • 实验数据与化学显式模型的比较.
  • 动态建模以评估OH基的空间分布.

主要成果:

  • 在暴露于人体臭氧时观察到高度的OH基.
  • 由臭氧-烯反应形成的6-甲基-5-二 (6-MHO) 被确定为一个关键的OH前体.
  • 试验OH度与模型预测一致.
  • 人类产生的OH场被证明取决于臭氧的流入.

结论:

  • 人类皮肤在暴露于臭氧时会积极产生OH基.
  • 这种过程会产生局部氧化场,对室内化学有影响.
  • 了解这种现象对于评估室内化学物质的寿命和对人类健康的影响至关重要.