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Related Concept Videos

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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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.
The hydrogenation process takes place on the...
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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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Alkenes via Reductive Coupling of Aldehydes or Ketones: McMurry Reaction01:22

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The radical dimerization of ketones or aldehydes gives vicinal diols through a pinacol coupling reaction. However, the behavior of titanium metals used for the reaction as a source of electrons is unusual. When the reaction is carried out in the presence of titanium, diols can be isolated at low temperatures. Else titanium further reacts with diols, forming alkenes through the McMurry reaction.
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Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

3.5K
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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Cycloaddition Reactions: MO Requirements for Thermal Activation01:16

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Thermal cycloadditions are reactions where the source of activation energy needed to initiate the reaction is provided in the form of heat. A typical example of a thermally-allowed cycloaddition is the Diels–Alder reaction, which is a [4 + 2] cycloaddition. In contrast, a [2 + 2] cycloaddition is thermally forbidden.
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Related Experiment Video

Updated: Sep 23, 2025

Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production
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A highly efficient nano-sized Cu2O/SiO2 egg-shell catalyst for C-C coupling reactions.

Soohee Kim1, Shin Wook Kang2, Aram Kim1

  • 1Department of Chemistry, Chemistry Institute for Functional Materials, Pusan National University Busan 46241 Republic of Korea chemistry@pusan.ac.kr.

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|May 11, 2022
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Copper oxide (Cu2O) nanoparticles supported on mesoporous silica exhibit high catalytic activity for Sonogashira reactions. This egg-shell catalyst design enhances efficiency in synthesizing ynones.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Catalysis

Background:

  • Mesoporous silica (SiO2) supports are crucial for catalyst design.
  • Egg-shell catalyst structures offer advantages in reactant diffusion and active site accessibility.
  • Copper oxide (Cu2O) nanoparticles are effective catalytic components.

Purpose of the Study:

  • To synthesize and characterize mesoporous SiO2-supported Cu2O nanoparticles with an egg-shell structure.
  • To evaluate the catalytic performance of the synthesized nanocatalyst in Sonogashira reactions.
  • To understand the structure-activity relationship for enhanced catalytic efficiency.

Main Methods:

  • Impregnation method for preparing Cu2O/SiO2 egg-shell nanocatalysts.
  • Characterization of nanoparticle size, dispersion, and pore structure.
  • Application of the catalyst in solvent-free Sonogashira reactions for ynone synthesis.

Main Results:

  • Successfully prepared Cu2O/SiO2 egg-shell nanocatalysts with high surface area and narrow pore size distribution.
  • Achieved highly dispersed Cu2O nanoparticles (approx. 2.0 nm) on the mesoporous silica support.
  • Demonstrated very high catalytic activity in solvent-free Sonogashira reactions, synthesizing ynones from acyl chlorides and terminal alkynes.

Conclusions:

  • The egg-shell design with highly dispersed Cu2O nanoparticles on mesoporous SiO2 is highly effective for Sonogashira coupling.
  • Synergistic effects between the mesoporous structure and the precisely located active sites contribute to excellent catalytic performance.
  • This catalyst offers a promising approach for efficient and solvent-free synthesis of ynones.