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Sharpless Epoxidation02:57

Sharpless Epoxidation

4.0K
The conversion of allylic alcohols into epoxides using the chiral catalyst was discovered by K. Barry Sharpless and is known as Sharpless epoxidation. The use of a chiral catalyst enables the formation of one enantiomer of the product in excess. This chiral catalyst is mainly a chiral complex of titanium tetraisopropoxide and tartrate ester (specific stereoisomer). The stereoisomer used in the chiral catalyst dictates the formation of the enantiomer of the product. In other words, the use of...
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Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide02:44

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

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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.
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Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids02:04

Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids

5.8K
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.
5.8K
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...
3.3K
Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

Cycloaddition Reactions: MO Requirements for Photochemical Activation

2.1K
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.
2.1K
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
1.8K

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Updated: Jun 30, 2025

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
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Boosting Electrocatalytic Ethylene Epoxidation by Single Atom Modulation.

Hanyu Wang1,2, Shuo Wang1, Yanpeng Song1

  • 1State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, China.

Angewandte Chemie (International Ed. in English)
|March 21, 2024
PubMed
Summary
This summary is machine-generated.

A novel ruthenium-doped catalyst efficiently produces ethylene oxide (EO) from ethylene and water. This breakthrough offers a sustainable, low-carbon alternative for industrial EO production with high yield and activity.

Keywords:
ElectrocatalysisElectrosynthesisEthylene epoxidationEthylene oxideSingle atom catalyst

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Catalysis

Background:

  • Electrochemical synthesis of ethylene oxide (EO) offers a low-carbon alternative to traditional methods.
  • Current electrocatalytic routes suffer from low activity, selectivity, and stability.

Purpose of the Study:

  • To develop a highly active and stable electrocatalyst for ethylene epoxidation.
  • To investigate a single-atom doping strategy for enhancing catalyst performance.

Main Methods:

  • Synthesis of single atom Ru-doped hollandite KIr4O8 (KIrRuO) nanowire catalyst.
  • Electrochemical evaluation of the KIrRuO catalyst for ethylene epoxidation.
  • Analysis of catalyst structure and electronic properties.

Main Results:

  • The KIrRuO catalyst achieved a high EO partial current density of 0.7 A/cm².
  • An excellent EO yield of 92.0% was obtained.
  • Single Ru atom doping modulated electronic structures, stabilizing intermediates and facilitating active species formation.

Conclusions:

  • The KIrRuO catalyst demonstrates superior performance for chloride-mediated ethylene epoxidation.
  • Single-atom doping is an effective strategy to enhance reactivity of adjacent metal sites in heterogeneous electrocatalysts.
  • This work presents a promising pathway for sustainable ethylene oxide production.