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Related Concept Videos

Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

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.
Thermal Electrocyclic Reactions: Stereochemistry01:17

Thermal Electrocyclic Reactions: Stereochemistry

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.
Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

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
Electrochemistry: Overview01:04

Electrochemistry: Overview

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,...
Electrochemical Systems01:24

Electrochemical Systems

Electrochemical systems provide a fascinating insight into the dynamic interplay of charged species within various phases. One notable example is the interaction between a membrane permeable to K⁺ ions but not to Cl⁻ ions, separating an aqueous KCl solution from pure water. As K⁺ ions diffuse through the membrane, they generate net charges on each phase, leading to a potential difference between them.Similarly, when a piece of Zn is immersed in an aqueous ZnSO₄ solution, the Zn metal, composed...
Electrochemical Cells01:28

Electrochemical Cells

Electrochemical cells are systems that convert chemical energy into electrical energy or use electrical energy to drive chemical reactions. They consist of two electrodes in contact with an electrolyte, where redox reactions enable electron transfer. Most electrochemical cells include two half-cells connected by an external wire for electron flow and a salt bridge for ion flow. The salt bridge contains an electrolyte solution and maintains charge neutrality by allowing ions—not electrons—to...

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AC Electrokinetic Phenomena Generated by Microelectrode Structures
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Sonoelectrochemical effects in electro-organic systems.

David J Walton1, J Iniesta, M Plattes

  • 1School of Science and the Environment, Coventry University, Priory Street, Coventry CV1 5FB, UK. apc064@coventry.ac.uk

Ultrasonics Sonochemistry
|June 24, 2003
PubMed
Summary

Researchers explored organic sonoelectrochemistry, using ultrasound and electricity for chemical reactions. Studies covered thiophene monoxide oxidation, dye pollutant breakdown, and creating conductive polymers and modified proteins.

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Area of Science:

  • Organic chemistry
  • Electrochemistry
  • Sonochemistry

Background:

  • Sonoelectrochemistry combines ultrasound and electrochemical techniques.
  • This interdisciplinary field offers novel synthetic pathways.
  • Coventry University has ongoing research in this area.

Purpose of the Study:

  • To present recent advancements in organic sonoelectrochemistry.
  • To highlight diverse applications of the technique.
  • To showcase studies conducted at Coventry University.

Main Methods:

  • Utilizing sonoelectrochemical reactors for organic synthesis.
  • Applying ultrasonic irradiation to electrochemical processes.
  • Investigating oxidation, degradation, polymerization, and modification reactions.

Main Results:

  • Successful oxidation of thiophene monoxides.
  • Effective degradation of dye pollutants.
  • Formation of conducting polymers.
  • Electrosynthetic modification of proteins achieved.

Conclusions:

  • Organic sonoelectrochemistry is a versatile tool for various chemical transformations.
  • The technique shows promise in environmental remediation and materials science.
  • Further research at Coventry University continues to expand its scope.