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Related Concept Videos

Radical Oxidation of Allylic and Benzylic Alcohols01:21

Radical Oxidation of Allylic and Benzylic Alcohols

Activated manganese(IV) oxide can selectively oxidize allylic and benzylic alcohols via a radical intermediate mechanism. Primary allylic alcohols are oxidized to aldehydes, while secondary allylic alcohols yield ketones. The redox reaction of potassium permanganate with an Mn(II) salt such as manganese sulfate (under either alkaline or acidic conditions), followed by thorough drying, yields the oxidizing agent: activated MnO2. While MnO2 is insoluble in the solvents used for the reaction, the...
Catalysis01:27

Catalysis

Catalysis influences the rate of chemical reactions by providing an alternative reaction pathway with lower activation energy. A catalyst speeds up a reaction, but it is not consumed during the process. The fundamental principle of catalysis is the ability of a catalyst to alter the reaction mechanism, often introducing a more efficient pathway than the uncatalyzed process.In a catalyzed reaction, the catalyst participates directly in the reaction mechanism. It interacts with reactants to form...
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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.
Heterogeneous Catalysis01:22

Heterogeneous Catalysis

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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Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate02:21

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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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Mononuclear water oxidation catalysts.

Dennis G H Hetterscheid1, Joost N H Reek

  • 1Van 't Hoff Institute for Molecular Sciences, University of Amsterdam, Amsterdam, The Netherlands. d.g.h.hetterscheid@uva.nl

Angewandte Chemie (International Ed. in English)
|September 1, 2012
PubMed
Summary

Mononuclear water oxidation catalysts are a recent breakthrough, challenging the need for multiple metal sites. This review covers new catalysts and their use in devices for producing oxygen and hydrogen.

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Area of Science:

  • Catalysis
  • Inorganic Chemistry
  • Renewable Energy

Background:

  • Historically, efficient water oxidation required at least two metal sites.
  • Recent advancements have introduced mononuclear catalysts for water oxidation.
  • This challenges established principles in catalysis.

Purpose of the Study:

  • To review mononuclear water oxidation catalysts reported in the last five years.
  • To discuss their implementation in prototype devices.
  • To highlight the coupling of dioxygen formation with dihydrogen production.

Main Methods:

  • Literature review of mononuclear water oxidation catalysts.
  • Analysis of catalyst performance and stability.
  • Examination of prototype device designs and efficiency.

Main Results:

  • Several mononuclear catalysts have been successfully developed.
  • These catalysts demonstrate efficient water oxidation capabilities.
  • Successful integration into devices for coupled hydrogen and oxygen production.

Conclusions:

  • Mononuclear catalysts represent a significant advancement in water oxidation.
  • These catalysts offer a promising pathway for artificial photosynthesis and sustainable energy.
  • Further development of mononuclear catalysts is crucial for efficient renewable energy systems.