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Related Concept Videos

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...
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

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...
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...
Catalysis02:50

Catalysis

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.
Gravimetry: Inorganic And Organic Precipitating Agents00:49

Gravimetry: Inorganic And Organic Precipitating Agents

In gravimetry, the precipitant is chosen carefully to obtain a pure solid that can be easily filtered. Common inorganic precipitants can be used to determine several cations and anions. In some cases, the formation of the same precipitate can be used to determine the cation and the anion. For example, the reaction of barium and chromate ions to give barium chromate is used to determine both barium and chromate. However, precipitates such as hydroxides, oxalates, and metal ammonium phosphates...
Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

Cycloaddition Reactions: MO Requirements for Photochemical Activation

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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Updated: May 16, 2026

A Microwave-Assisted Direct Heteroarylation of Ketones Using Transition Metal Catalysis
07:06

A Microwave-Assisted Direct Heteroarylation of Ketones Using Transition Metal Catalysis

Published on: February 16, 2020

Magnetically retrievable catalysts for organic synthesis.

R B Nasir Baig1, Rajender S Varma

  • 1Sustainable Technology Division, National Risk Management Research Laboratory, US Environmental Protection Agency, Cincinnati, Ohio 45268, USA.

Chemical Communications (Cambridge, England)
|December 6, 2012
PubMed
Summary

Magnetic nanoparticles (MNPs) offer a sustainable solution for catalyst recovery in organic synthesis. These magnetic catalysts can be easily separated and reused, reducing costs and environmental impact.

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Last Updated: May 16, 2026

A Microwave-Assisted Direct Heteroarylation of Ketones Using Transition Metal Catalysis
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A Microwave-Assisted Direct Heteroarylation of Ketones Using Transition Metal Catalysis

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Efficient Construction of Drug-like Bispirocyclic Scaffolds Via Organocatalytic Cycloadditions of &#945;-Imino &#947;-Lactones and Alkylidene Pyrazolones
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Light-driven Molecular Motors on Surfaces for Single Molecular Imaging
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Light-driven Molecular Motors on Surfaces for Single Molecular Imaging

Published on: March 13, 2019

Area of Science:

  • Organic Chemistry
  • Materials Science
  • Catalysis

Background:

  • Catalyst recovery and reuse are crucial for sustainable chemical processes.
  • Expensive catalysts necessitate efficient separation and recycling methods.
  • Heterogenization of catalysts is a key strategy for enabling reuse.

Purpose of the Study:

  • To summarize the advancements in synthesizing magnetic nanoparticles (MNPs) for catalytic applications.
  • To highlight the use of MNPs as supports for catalysts in organic synthesis.
  • To review the catalytic performance and reusability of magnetic catalysts.

Main Methods:

  • Synthesis of magnetic nanoparticles.
  • Immobilization of catalysts onto MNPs.
  • Application of magnetic catalysts in various organic reactions.
  • Separation and recovery of MNPs using external magnets.

Main Results:

  • MNPs effectively support various catalysts for organic synthesis.
  • Magnetic catalysts demonstrate high activity and selectivity.
  • Efficient recovery and reuse of magnetic catalysts without significant loss of activity.
  • Facilitation of sustainable catalytic processes through MNP technology.

Conclusions:

  • Magnetic nanoparticles provide an efficient platform for catalyst heterogenization.
  • The use of MNPs enables facile catalyst separation and recycling, promoting greener chemistry.
  • Magnetic catalysts are a promising tool for sustainable organic synthesis.