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Related Concept Videos

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 Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

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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...
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Reduction of Alkenes: Catalytic Hydrogenation02:13

Reduction of Alkenes: Catalytic Hydrogenation

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Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
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Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

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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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Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

2.4K
Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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Electrophilic Aromatic Substitution: Nitration of Benzene01:20

Electrophilic Aromatic Substitution: Nitration of Benzene

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The nitration of benzene is an example of an electrophilic aromatic substitution reaction. It involves the formation of a very powerful electrophile, the nitronium ion, which is linear in shape. The reaction occurs through the interaction of two strong acids, sulfuric and nitric acid.
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Electrogenerated Nickel Catalyst for C-N Cross-Coupling.

Stéphane Sengmany1, Farah Daili1, Ibtihal Kribii1

  • 1Université Paris-Est Créteil, ICMPE (UMR 7182), CNRS, UPEC, 94320 Thiais, France.

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|December 14, 2022
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This study introduces an electrochemical method for synthesizing arylamines using nickel catalysis. The new approach avoids sensitive nickel complexes, offering a simpler and milder alternative for producing diverse arylamines from aryl halides.

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Area of Science:

  • Organic Chemistry
  • Electrochemistry
  • Catalysis

Background:

  • Arylamines are crucial structural motifs in natural products and pharmaceuticals.
  • Traditional nickel-catalyzed amination of aryl halides often requires expensive, air-sensitive nickel complexes.
  • Existing C-N cross-coupling methods face challenges with catalyst stability and cost.

Purpose of the Study:

  • To develop a cost-effective and user-friendly method for arylamine synthesis.
  • To circumvent the limitations associated with conventional nickel complexes in C-N cross-coupling reactions.
  • To establish an electrochemical strategy for the in situ generation of nickel catalysts.

Main Methods:

  • An electrochemical approach utilizing a sacrificial anode process was employed.
  • Nickel salts were generated in situ to catalyze the amination of aryl halides.
  • The reaction proceeded under mild conditions, simplifying experimental setup.

Main Results:

  • The electrochemical method successfully facilitated the amination of aryl halides.
  • A wide range of arylamines were synthesized efficiently.
  • The process demonstrated robustness and applicability to diverse substrates.

Conclusions:

  • The developed electrochemical method provides a practical alternative for arylamine synthesis.
  • This approach overcomes the need for pre-formed, sensitive nickel catalysts.
  • The study highlights the potential of electrochemistry in sustainable and accessible organic synthesis.