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Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

2.2K
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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Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide02:44

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

12.5K
Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
12.5K
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

3.8K
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...
3.8K
Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

Cycloaddition Reactions: MO Requirements for Photochemical Activation

2.6K
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.
2.6K
Catalysis02:50

Catalysis

30.0K
The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
30.0K
Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

8.9K
Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
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Development of Heterogeneous Enantioselective Catalysts using Chiral Metal-Organic Frameworks MOFs
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基于金属有机框架的高效单片异质光反氧催化剂用于有氧C-H功能化.

Sreehari Surendran Rajasree1, Bapan Saha1, Grant M Kelly1

  • 1School of Chemical Science, Southern Illinois University, 1245 Lincoln Drive, Carbondale, IL 62901.

ACS catalysis
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概括

这项研究介绍了单点激发状态金属有机框架 (MOF) 作为高效的异质光催化剂. 这些单元MOF在有氧反应中优于传统的三元催化剂,为可持续化学提供了一个新的平台.

关键词:
单片式光催化剂是一种光催化剂.轻度收获的收获方式金属有机框架的框架.摄影染物 摄影染物多孔多样化的多样化.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 摄影化学的使用.
  • 催化剂是一种催化剂.

背景情况:

  • 有效的光采集和能量传输对于生物灵感异质光催化剂至关重要.
  • 传统的光催化剂通常依赖于三重激发状态 (PS *) 并遭受扩散限制.
  • 单元激发状态 (PS*) 为人工光系统提供了一个新的范式,特别是用于有氧光氧过程,避免单元氧气生成.

研究的目的:

  • 研究使用单片激发状态 (MOF*) 作为异质光催化剂的中孔金属有机框架 (MOF) 的潜力.
  • 为了比较MOF*系统的催化活性与传统的三重光敏感剂 (PS*) 基准.
  • 探索基于MOF*的光催化剂的机械路径和基质范围.

主要方法:

  • 三种基于的中等性MOF (PCN-222(H2),NU-1000和SIU-100) 的合成和表征.
  • 在N-aryl-tetrahydroquinone的有氧*aza*-Henry反应中的催化活性评估.
  • 机械学研究涉及分析电子转移通路,单元与三元激发状态以及基质电子性质.

主要成果:

  • 与PS*基准相比,研究的中孔性Zr-MOF在有氧*aza*-Henry反应中表现出优越的催化活性.
  • 由于高单元能量和激发状态的氧化还原潜力,MOF*通过氧化或还原火途径在光产物形成中表现出灵活性.
  • 反应速率主要受光诱导电子转移的驱动力,受MOF和基板电子特性的影响,基板电子决定了产品的身份.

结论:

  • 使用单点激发状态的半孔MOF为开发有效的异质光反氧化催化剂提供了有利的平台.
  • MOF*系统为有氧光电还原反应提供了增强的催化性能和机械灵活性.
  • 这项工作突显了为优化光催化应用量身定制MOF电子属性的潜力.