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Related Concept Videos

Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

2.9K
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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Thermal Electrocyclic Reactions: Stereochemistry01:17

Thermal Electrocyclic Reactions: Stereochemistry

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The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
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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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Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

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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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Electrochemistry: Overview01:04

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Electrochemistry is the branch of chemistry that studies the relationship between electrical quantities and chemical reactions, particularly oxidation and reduction. Oxidation is the loss of electrons from a substance, whereas reduction refers to the gain of electrons. A substance with a strong electron affinity is called an oxidizing agent (oxidant), and a reducing agent (reductant) is a species that donates electrons. Oxidation and reduction processes are pivotal to electrochemical reactions,...
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Redox Equilibria: Overview01:23

Redox Equilibria: Overview

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A reduction-oxidation reaction is commonly called a redox reaction. In a redox reaction, electrons are transferred from one species to another rather than being shared between or among atoms. The reducing agent or reductant is the species that loses electrons and gets oxidized in the process. The species that gains electrons and gets reduced in the process is the oxidizing agent or oxidant. Redox reactions are represented as two separate equations called half-reactions, where one equation...
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Updated: Jan 7, 2026

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction

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From Electronic Structure to Catalytic Function: Rare Earth-Driven Strategies for CO2 Electroreduction.

Xinyi Huang1, Chengli Rong1, Yuan Chen1

  • 1School of Chemical and Biomolecular Engineering, The University of Sydney, Darlington, New South Wales, Australia.

Small (Weinheim an Der Bergstrasse, Germany)
|December 29, 2025
PubMed
Summary

Rare-earth elements enhance electrochemical carbon dioxide reduction (CO2RR) catalysts, improving selectivity and durability. Future research focuses on advanced design for carbon-neutral CO2 conversion.

Keywords:
carbon dioxide reductionelectrocatalystrare earth element

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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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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Electrochemical carbon dioxide reduction (CO2RR) offers a path to mitigate emissions and produce valuable chemicals.
  • Traditional transition-metal catalysts face challenges in selectivity, overpotentials, and durability.
  • Rare-earth elements present unique properties for advanced CO2RR catalyst development.

Purpose of the Study:

  • To review recent advancements in rare-earth-based electrocatalysts for CO2RR.
  • To highlight how rare-earth elements address limitations of conventional catalysts.
  • To outline future research directions for efficient CO2 conversion.

Main Methods:

  • Review of rare-earth-based single-atom catalysts (SACs), alloys, and oxides.
  • Analysis of strategies including atomic dispersion, synergistic effects, and oxygen vacancies.
  • Examination of catalyst performance in activity, selectivity, and durability.

Main Results:

  • Rare-earth SACs modulate electronic structures and suppress hydrogen evolution.
  • Rare-earth alloys exhibit synergistic effects, enhancing selectivity for desired products.
  • Rare-earth oxides and mixed phases activate CO2 and improve catalyst stability.

Conclusions:

  • Rare-earth-based catalysts significantly improve CO2RR activity, selectivity, and durability.
  • Challenges include atomic dispersion stability, conductivity, and multi-carbon product selectivity.
  • Future work should emphasize rational design, operando characterization, and machine learning for CO2 conversion.