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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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Radical Substitution: Hydrogenolysis of Alkyl Halides with Tributyltin Hydride01:26

Radical Substitution: Hydrogenolysis of Alkyl Halides with Tributyltin Hydride

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Radical substitution reactions can be used to remove functional groups from molecules. The hydrogenolysis of alkyl halides is one such reaction, where the weak Sn–H bond in tributyltin hydride reacts with alkyl halides to form alkanes. Here, the reagent Bu3SnH yields tributyltin halide as a byproduct.
The bonds formed in this reaction are stronger than the bonds broken, making it energetically favorable. The reaction follows a radical chain mechanism similar to radical halogenation reactions,...
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Acid Halides to Carboxylic Acids: Hydrolysis01:01

Acid Halides to Carboxylic Acids: Hydrolysis

3.5K
Hydrolysis of acid halides is a nucleophilic acyl substitution reaction in which acid halides react with water to give carboxylic acids. The reaction occurs readily and does not require acid or a base catalyst.
As shown below, the mechanism involves a nucleophilic attack by water at the carbonyl carbon to form a tetrahedral intermediate. This is followed by the reformation of the carbon–oxygen π bond along with the departure of a halide ion. A final proton transfer step yields carboxylic...
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Acid Halides to Alcohols: LiAlH4 Reduction01:19

Acid Halides to Alcohols: LiAlH4 Reduction

3.9K
Acid halides are reduced to alcohols in the presence of a strong reducing agent like lithium aluminum hydride.
The mechanism proceeds in three steps. First, the nucleophilic hydride ion attacks the carbonyl carbon of the acid halide to form a tetrahedral intermediate. Next, the carbonyl group is re-formed, and the halide ion departs as a leaving group, generating an aldehyde. A second nucleophilic attack by the hydride yields an alkoxide ion, which, upon protonation, gives a primary alcohol as...
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Ethers to Alkyl Halides: Acidic Cleavage02:18

Ethers to Alkyl Halides: Acidic Cleavage

7.0K
Ethers are generally unreactive and unsuitable for direct nucleophilic substitution reactions since the alkoxy groups are strong bases and, therefore, poor leaving groups. However, ethers readily undergo acidic-cleavage reactions. Ethers can be converted to alkyl halides when heated with strong acids such as HBr and HI in a sequence of two substitution reactions.
7.0K
Aqueous Solutions and Heats of Hydration02:42

Aqueous Solutions and Heats of Hydration

17.5K
Water and other polar molecules are attracted to ions. The electrostatic attraction between an ion and a molecule with a dipole is called an ion-dipole attraction. These attractions play an important role in the dissolution of ionic compounds in water.
When ionic compounds dissolve in water, the ions in the solid separate and disperse uniformly throughout the solution because water molecules surround and solvate the ions, reducing the strong electrostatic forces between them. This process...
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基于HAN的离子液体的等离子体驱动分解

Caleb Medchill1,2, Curtis Hauck1, Armando A Perezselsky2

  • 1Ming Hsieh Department of Electrical Engineering, University of Southern California, Los Angeles, California 90089, United States.

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纳米秒脉冲过渡性等离子体启动离子液体的非热分解,使得外热反应的快速开启/关闭控制成为可能. 这种等离子体方法产生反应性物种,为控制燃烧提供了一条新的途径.

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科学领域:

  • 等离子体科学与工程等离子体科学与工程
  • 化学动力学 化学动力学
  • 材料科学 材料科学 材料科学

背景情况:

  • 离子液体 (ILs) 具有独特的特性,但它们的可控分解以释放能量仍然具有挑战性.
  • 传统的IL分解方法通常依赖于热能,而热能很难精确控制.
  • 对于先进的能量材料来说,开发用于IL中的外热反应的新型启动和控制方法至关重要.

研究的目的:

  • 调查纳米秒脉冲瞬态等离子体的使用,以启动和控制离子液体的外热分解.
  • 阐明底层的等离子驱动分解机制,包括气泡形成和反应性物种生成.
  • 为了证明在ILs中的等离子体诱导点火和燃烧的快速切换 (打开/关闭) 能力.

主要方法:

  • 在含有离子液体的同轴圆柱形等离子反应器中释放纳秒脉冲 (20 kV,20 ns,高达10 kHz).
  • 实时高速成像,观察等离子体启动,泡动态和燃烧演变.
  • 现场等离子辐射光谱和FTIR辐射光谱用于识别反应性中间体和燃烧产品.

主要成果:

  • 纳米秒等离子体成功启动了酸 (HAN) 和[EMIM]/[EtSO4]离子液体混合物的非热分解和燃烧.
  • 高速成像证实了快速点火和灭,火焰可以在66毫秒内切换.
  • 谱分析确定了关键的反应中间体 (H,O,S,NO,CO) 和产物 (CO2,H2O),证实了燃烧.
  • 发现等离子体诱导的分解途径与传统的热方法有很大的不同.

结论:

  • 纳米秒脉冲瞬态等离子体提供了一种有效的方法,用于启动和控制离子液体的外热分解.
  • 这种由等离子体驱动的机制涉及泡形成,介电分解和产生高度反应的基因物种.
  • 这种技术提供了精确,快速控制离子液体中的燃烧过程,与热方法不同.