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Extraction: Advanced Methods00:56

Extraction: Advanced Methods

446
Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
446
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
20.8K
Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

1.8K
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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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...
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Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

Cycloaddition Reactions: MO Requirements for Photochemical Activation

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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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Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

3.3K
Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
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宏环铜 (II) 复合物作为电化学介导原子转移的催化剂.

Masnun Naher1, Chuyi Su1, Jeffrey R Harmer2

  • 1School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane 4072, Australia.

Inorganic chemistry
|March 25, 2024
PubMed
概括

这项研究探讨了N4宏环铜复合物用于电化学原子转移激素添加 (eATRA) 的C-C键形成. 虽然一个复合体表现出快速的基因捕获,但它导致了自我消灭,而不是所需的添加.

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科学领域:

  • 有机金属化学 有机金属化学
  • 催化剂是一种催化剂.
  • 电化学 电化学 电化学

背景情况:

  • 铜催化电化学原子转移激素添加 (eATRA) 为C-C键形成提供了一个温和的途径.
  • 作为eATRA反应的前催化剂,N4宏环铜复合物被研究.
  • 了解催化剂结构-活性关系对于优化eATRA至关重要.

研究的目的:

  • 评估一系列N4宏环Cu (II) 复合物作为eATRA的前催化剂.
  • 描述这些复合物的结构,光谱和电化学特性.
  • 在eATRA中将复杂结构与激素激活和催化性能相关联.

主要方法:

  • 合成和N4宏环Cu (II) 复合物的完整表征.
  • 电化学研究以确定氧化还原潜力和激活通路.
  • 评估eATRA反应中的催化活性,监测基因生成和捕获.
  • 介质有机铜物种的结构分析.

主要成果:

  • 一系列N4宏环Cu (II) 复合物的合成和特征.
  • 在复杂序列中观察到不同的基因激活反应活性.
  • [CuI ((Me2py2clen)) ((NCMe) ]+复合体表现出快速的基因捕获,形成一个有机铜中间体.
  • 然而,这种快速捕获导致了催化剂的自我终结,而不是生产性的激素添加.

结论:

  • 在eATRA中,N4宏环铜复合体表现出多样化的反应性.
  • 通过有机铜中间体的快速基因捕获可以加速催化,但可能导致不必要的自我终结.
  • 需要进一步设计催化剂,以防止自我终止并实现高效的eATRA.