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Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate02:21

Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate

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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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Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide02:44

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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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Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation02:47

Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation

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Introduction
One of the convenient methods for the preparation of aldehydes and ketones is via hydration of alkynes. Hydroboration-oxidation of alkynes is an indirect hydration reaction in which an alkyne is treated with borane followed by oxidation with alkaline peroxide to form an enol that rapidly converts into an aldehyde or a ketone. Terminal alkynes form aldehydes, whereas internal alkynes give ketones as the final product.
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Heterogeneous Catalysis01:22

Heterogeneous Catalysis

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Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...
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Catalysis02:50

Catalysis

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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.
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Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

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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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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
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Graphyne-supported single Fe atom catalysts for CO oxidation.

Ping Wu1, Pan Du, Hui Zhang

  • 1Jiangsu Key Laboratory of New Power Batteries, Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, College of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210097, P. R. China. wuping@njnu.edu.cn cxcai@njnu.edu.cn.

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|November 28, 2014
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Summary
This summary is machine-generated.

Graphyne serves as an excellent substrate for single iron atom catalysts (SACs), enhancing CO oxidation efficiency. This Fe-graphyne catalyst shows promise for environmental applications by mitigating CO emissions.

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Area of Science:

  • Materials Science
  • Catalysis
  • Computational Chemistry

Background:

  • Single atom catalysts (SACs) are crucial for maximizing metal atom efficiency.
  • Synthesizing SACs requires suitable substrates for stable, dispersed single atoms.
  • Graphyne's potential as a substrate for SACs remains largely unexplored.

Purpose of the Study:

  • To investigate graphyne as a substrate for single iron atom catalysts (Fe-SACs).
  • To evaluate the catalytic activity of Fe-graphyne SACs for CO oxidation.
  • To elucidate the reaction mechanism of CO oxidation on Fe-graphyne SACs using DFT calculations.

Main Methods:

  • Density Functional Theory (DFT) calculations were employed.
  • Binding and diffusion energy barriers for Fe atoms on graphyne were computed.
  • Adsorption characteristics and reaction mechanisms for CO oxidation were simulated.

Main Results:

  • Fe atoms exhibit strong binding energy (∼4.99 eV) and high diffusion barrier (∼1.0 eV) on graphyne.
  • Fe-graphyne SACs demonstrate high catalytic activity for CO oxidation.
  • The Eley-Rideal mechanism is favored for CO oxidation, with a low energy barrier (∼0.21 eV) for the rate-limiting step.

Conclusions:

  • Graphyne is a promising substrate for synthesizing highly dispersed SACs.
  • Fe-graphyne SACs show significant potential for CO oxidation catalysis.
  • These findings suggest applications in environmental remediation and fuel cells.