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Related Concept Videos

Heterogeneous Catalysis01:22

Heterogeneous Catalysis

18
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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Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

Cycloaddition Reactions: MO Requirements for Photochemical Activation

2.8K
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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Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

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The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
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Catalysis02:50

Catalysis

31.3K
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.
31.3K
Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

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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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Cycloaddition Reactions: MO Requirements for Thermal Activation01:16

Cycloaddition Reactions: MO Requirements for Thermal Activation

4.9K
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.
4.9K

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Related Experiment Video

Updated: Mar 6, 2026

Synthesis and Performance Evaluations of ZnCoS/ZnCdS with Twin Crystal Structure for Multifunctional Redox Photocatalysis in Energy Applications
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Synthesis and Performance Evaluations of ZnCoS/ZnCdS with Twin Crystal Structure for Multifunctional Redox Photocatalysis in Energy Applications

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Bifunctional Photocatalysts: Exploiting Proximity for Enhanced Reaction Performance.

Luigi Dolcini1,2, Daniele Lavelli1, Alberto Dal Corso1

  • 1Dipartimento di Chimica, Università degli Studi di Milano, Milano, Italy.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|March 4, 2026
PubMed
Summary

Bifunctional photocatalysis uses single or dual catalytic units to enhance enantioselective transformations. This review highlights recent advances in bivalent photocatalysts, comparing them to dual systems for improved stereocontrol.

Keywords:
bifunctional photocatalystcooperative effectscross‐couplingcycloadditionphotocatalysis

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Area of Science:

  • Catalysis
  • Photocatalysis
  • Organic Synthesis

Background:

  • Bifunctional approaches enhance catalytic effectiveness and enantioselectivity.
  • In photocatalysis, bifunctional systems introduce chirality for stereocontrol and manage short-lived intermediates.
  • Bivalent photocatalysts integrate photoactivity with other catalytic functions within a single molecule.

Purpose of the Study:

  • To review recent advancements in bifunctional and bivalent photocatalysis.
  • To compare the performance of bivalent photocatalysts with traditional dual catalytic systems.
  • To highlight the role of these systems in achieving enantioselective transformations.

Main Methods:

  • Literature review of recent photocatalysis studies.
  • Analysis of systems employing dual catalytic units.
  • Examination of systems utilizing single photoactive groups with additional functionalities (bivalent photocatalysts).

Main Results:

  • Bifunctional and bivalent photocatalysts offer effective strategies for stereocontrol in chemical reactions.
  • Recent examples demonstrate the successful application of these systems in enantioselective synthesis.
  • Bivalent photocatalysts show promise as efficient alternatives to dual catalytic systems.

Conclusions:

  • Bifunctional and bivalent photocatalysis represent powerful tools for developing advanced catalytic systems.
  • These approaches are crucial for achieving high enantioselectivity and efficiency in organic synthesis.
  • Further research into bivalent photocatalysts could lead to novel catalytic applications.