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Related Concept Videos

Radical Reactivity: Overview01:11

Radical Reactivity: Overview

Radicals, the highly reactive species, gain stability by undergoing three different reactions. The first reaction involves a radical-radical coupling, in which a radical combines with another radical, forming a spin‐paired molecule. The second reaction is between a radical and a spin‐paired molecule, generating a new radical and a new spin‐paired molecule. The third reaction is radical decomposition in a unimolecular reaction, forming a new radical and a spin‐paired molecule. These three...
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...
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.
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...
Radical Reactivity: Nucleophilic Radicals01:16

Radical Reactivity: Nucleophilic Radicals

Radicals adjacent to electron-donating groups are called nucleophilic radicals. These radicals readily react with electrophilic alkenes. The SOMO–LUMO interactions are the driving force for the reaction, where the high-energy SOMO of the electron-rich, nucleophilic radicals interacts with the low-energy LUMO of the electron-deficient, electrophilic alkenes. Such SOMO–LUMO interactions are the basis of reactive radical traps, affecting the selectivity in radical reactions. For instance, consider...
Radical Reactivity: Intramolecular vs Intermolecular01:33

Radical Reactivity: Intramolecular vs Intermolecular

Radical reactions can occur either intermolecularly or intramolecularly. In an intermolecular radical reaction, a nucleophilic radical adds to an electrophilic alkene or vice versa. In such reactions, the radical and generally the alkene, which is also called the radical trap, are two different molecules. Additionally, for such intermolecular reactions to occur, the radical trap must be active, present in an excess concentration, and the radical starting material must have a weak carbon–halogen...

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Related Experiment Video

Updated: Jul 8, 2026

Synthesis and Testing of Supported Pt-Cu Solid Solution Nanoparticle Catalysts for Propane Dehydrogenation
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Published on: July 18, 2017

Single-Particle Spectro-Catalytic Platform Enabling High-Efficiency Synthesis and Mechanistic Tracking of Cu-Driven

Qinhui Xie1, Lei Zhang1, Junbo Li1

  • 1College of Chemistry, Chemical Engineering and Resource Utilization, Northeast Forestry University, Harbin, P. R. China.

Small (Weinheim an Der Bergstrasse, Germany)
|July 6, 2026
PubMed
Summary

A novel Cu/ZnO catalyst enables efficient benzimidazole synthesis via a radical pathway, avoiding aldehyde byproducts. In situ monitoring reveals mechanistic insights for sustainable heterocycle production.

Keywords:
bifunctional nanocatalystshigh‐efficiency photocatalysisradical‐mediated synthesissingle‐particle SERSsustainable heterocycle synthesis

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Catalytic Reactions at Amine-Stabilized and Ligand-Free Platinum Nanoparticles Supported on Titania During Hydrogenation of Alkenes and Aldehydes
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Catalytic Reactions at Amine-Stabilized and Ligand-Free Platinum Nanoparticles Supported on Titania During Hydrogenation of Alkenes and Aldehydes

Published on: June 24, 2022

Area of Science:

  • Catalysis
  • Materials Science
  • Organic Chemistry

Background:

  • Conventional benzimidazole synthesis methods suffer from harsh conditions, byproduct formation, and limited mechanistic understanding.
  • Developing efficient and sustainable catalytic systems for heterocycle synthesis remains a significant challenge.

Purpose of the Study:

  • To engineer a bifunctional Cu/ZnO catalyst for high-efficiency benzimidazole synthesis.
  • To enable in situ mechanistic monitoring of the catalytic process.
  • To elucidate the radical-driven reaction pathway and overcome limitations of traditional methods.

Main Methods:

  • Fabrication of a bifunctional Cu/ZnO catalyst with enhanced Lewis acidity and photocatalytic activity.
  • Utilizing surface-enhanced Raman scattering (SERS) spectroscopy for in situ mechanistic studies.
  • Investigating the radical generation and cross-coupling mechanism via α-C─H bond cleavage.

Main Results:

  • The Cu/ZnO catalyst demonstrated high Lewis acidity and enhanced charge separation, leading to a 6-fold increase in photocurrent.
  • A record 2-methylbenzimidazole (2MBZ) productivity of 3.28 mmol g⁻¹ h⁻¹ with 98% yield was achieved via a radical pathway, bypassing aldehyde intermediates.
  • SERS spectroscopy successfully captured transient radical intermediates and Schiff bases, providing direct mechanistic insights.

Conclusions:

  • The engineered Cu/ZnO catalyst offers a synergistic strategy for efficient and sustainable benzimidazole synthesis.
  • The radical-driven pathway effectively circumvents byproduct formation, enhancing reaction efficiency and yield.
  • Integrated photocatalysis and in situ mechanistic tracking provide a powerful platform for developing advanced catalytic systems.