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Acid-Catalyzed Hydration of Alkenes02:45

Acid-Catalyzed Hydration of Alkenes

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Alkenes react with water in the presence of an acid to form an alcohol. In the absence of acid, hydration of alkenes does not occur at a significant rate, and the acid is not consumed in the reaction. Therefore, alkene hydration is an acid-catalyzed reaction.
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Formation of Complex Ions03:45

Formation of Complex Ions

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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
23.6K
Ions as Acids and Bases02:54

Ions as Acids and Bases

23.7K
Salts with Acidic Ions
Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:
23.7K
Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration02:34

Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration

8.4K
The rate of acid-catalyzed hydration of alkenes depends on the alkene's structure, as the presence of alkyl substituents at the double bond can significantly influence the rate.
8.4K
Lewis Acids and Bases02:33

Lewis Acids and Bases

44.0K
In 1923, G. N. Lewis proposed a generalized definition of acid-base behavior in which acids and bases are identified by their ability to accept or to donate a pair of electrons and form a coordinate covalent bond.
A coordinate covalent bond (or dative bond) occurs when one of the atoms in the bond provides both bonding electrons. For example, a coordinate covalent bond occurs when a water molecule combines with a hydrogen ion to form a hydronium ion. A coordinate covalent bond also results when...
44.0K
Aldehydes and Ketones with Water: Hydrate Formation01:20

Aldehydes and Ketones with Water: Hydrate Formation

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An oxygen-based nucleophile, like water, can undergo addition reactions with aldehydes and ketones. The reaction leads to the formation of hydrates, also referred to as 1,1-diols or geminal diols.
The formation of hydrates is a reversible reaction. Hydrate formation is influenced by steric and electronic factors accompanying the alkyl substituents on the carbonyl group: The rate of hydrate formation increases with a decrease in the number of alkyl groups attached to the carbonyl carbon. Hence,...
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Computation of Atmospheric Concentrations of Molecular Clusters from ab initio Thermochemistry
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化甲酸集群及其与电子的相互作用

Kevin Li1, Jozef Ďurana2, Barbora Kocábková2

  • 1Lehrstuhl für Physikalische Chemie, TUM School of Natural Sciences, Technische Universität München, Lichtenbergstraße 4, 85748, Garching, Germany.

Chemphyschem : a European journal of chemical physics and physical chemistry
|February 19, 2024
PubMed
概括

研究与水合甲酸 (FA) 集群的电子相互作用,揭示了不同的离子形成路径. 电子电离主要产生质子离子,而电子附着显示大小和能量依赖的碎片化,影响集群组成分析.

关键词:
通过键结合,形成键.离子-分子反应是离子-分子反应.电离化的电离.质谱测量质谱测量质谱测量质谱测量质量测量质谱测量质量测量质量测量质量测量质量测量质量测量质量测量质量测量质量测量质量测量质量测量质量测量质量测量质量测量质量测量质量测量质量测量质量测量质量测量质量测量溶剂的作用是溶剂的作用.

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科学领域:

  • 物理化学 物理化学
  • 化学物理 化学物理
  • 材料科学 材料科学 材料科学

背景情况:

  • 了解水合集群的行为对于各种化学和物理过程至关重要.
  • 酸 (FA) 和水集群作为研究溶解和电离现象的模型系统.
  • 电子-物质相互作用是许多化学反应和分析技术的基础.

研究的目的:

  • 为了研究在化甲酸 (FA) 集群中在电子冲击时的离子形成.
  • 阐明电子电离 (EI) 和电子附着 (EA) 下的离子形成和碎片化的机制.
  • 确定集群大小,水化水平和电子能量对离子光谱和集群组成分析的影响.

主要方法:

  • 使用可变能量的电子在水合甲基酸集群中对离子形成的实验研究.
  • 专注于70 eV的电子电离 (EI) 和1.515 eV的低能电子附着 (EA).
  • 对正负离子质谱的分析,以确定碎片离子和评估集群组成.

主要成果:

  • 电子电离 (EI) 主要在富含FA的星团中产生质子化[FAm+H]+离子和稳定的环结构,围绕H3O+形成.
  • 低能电子附着 (EA) 有利于完整的[FAm·Wn]−离子的形成,而更高的能量则促进了对[FAm·Wn-H]−的碎片化.
  • 集群内部的离子-分子反应会影响更高电子能量的碎片化路径.
  • 集群中的水蒸发高度依赖于电离方法,这使得从质谱中计算中性集群大小的估计变得复杂.

结论:

  • 电离方法显著决定了水合甲基酸集群中的离子形成路径和碎片化模式.
  • 富含FA的星团的质谱可以提供对其大小和组成的见解,但必须考虑水蒸发的影响.
  • 从质谱中准确确定中性水合集群大小是具有挑战性的,因为依赖于电离的水损失.