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Related Concept Videos

Oxidative Cleavage of Alkenes: Ozonolysis01:46

Oxidative Cleavage of Alkenes: Ozonolysis

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In ozonolysis, ozone is used to cleave a carbon–carbon double bond to form aldehydes and ketones, or carboxylic acids, depending on the work-up.
Ozone is a symmetrical bent molecule stabilized by a resonance structure.
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Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide02:44

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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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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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Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids02:04

Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids

6.0K
Diols are compounds with two hydroxyl groups. In addition to syn dihydroxylation, diols can also be synthesized through the process of anti dihydroxylation. The process involves treating an alkene with a peroxycarboxylic acid to form an epoxide. Epoxides are highly strained three-membered rings with oxygen and two carbons occupying the corners of an equilateral triangle. This step is followed by ring-opening of the epoxide in the presence of an aqueous acid to give a trans diol.
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Atomically Strained Metal Sites for Highly Efficient and Selective Photooxidation.

Xinyuan Li1,2,3, Zechao Zhuang2, Jing Chai4

  • 1Energy and Catalysis Center, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, People's Republic of China.

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|March 24, 2023
PubMed
Summary

Strain engineering in vanadium oxide nanoribbons enhances catalytic activity. Introducing sodium cations creates atomic strain, significantly boosting photooxidation performance for cleaner chemical reactions.

Keywords:
Activation of Oxygen MoleculesAtomically Strained SitesPhotocatalytic OxidationVanadium Oxide

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Area of Science:

  • Materials Science
  • Catalysis
  • Nanotechnology

Background:

  • Strain engineering is key to improving heterogeneous catalyst performance.
  • Controlling atomic-scale strain in catalytic sites remains a challenge.

Purpose of the Study:

  • To achieve atomic strain modulation in ultrathin layered vanadium oxide nanoribbons.
  • To investigate the impact of strain on catalytic activity for photooxidation reactions.

Main Methods:

  • Utilized intercalation chemistry to introduce sodium cations (Na+) into V2O5 layers.
  • Synthesized Na+-V2O5 nanoribbons with modulated atomic strain.
  • Employed spectroscopy and theoretical calculations for analysis.

Main Results:

  • Na+-V2O5 exhibited significantly enhanced photooxidation performance (12-14x higher than V2O5 and VO2).
  • Atomic strain stretched V-O bonds, altering local charge distribution.
  • High surficial charge density on Na+-V2O5 improved oxygen molecule activation.

Conclusions:

  • Atomic strain modulation via intercalation is a viable strategy for catalyst design.
  • Strain-equipped catalysts show promise for selective photooxidation.
  • This method offers a new pathway for developing advanced catalysts.