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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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Oxidation and Reduction of Organic Molecules01:19

Oxidation and Reduction of Organic Molecules

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Energy production within a cell involves many coordinated chemical pathways. Most of these pathways are combinations of oxidation and reduction reactions, which occur at the same time. An oxidation reaction strips an electron from an atom in a compound, and the addition of this electron to another compound is a reduction reaction. Because oxidation and reduction usually occur together, these pairs of reactions are called redox reactions.
The removal of an electron from a molecule, results in a...
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Redox Reactions01:24

Redox Reactions

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Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
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Redox Reactions01:27

Redox Reactions

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Redox reactions are vital biochemical processes that underpin energy metabolism in cells. These reactions involve the transfer of electrons between molecules, occurring in tandem as oxidation and reduction. Oxidation refers to the loss of electrons, while reduction denotes their gain. This coupling ensures the seamless flow of electrons through metabolic pathways. For example, in bacterial metabolism, glucose undergoes oxidation to carbon dioxide, while oxygen is simultaneously reduced to...
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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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Photochemical Electrocyclic Reactions: Stereochemistry01:26

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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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Redox catalysis in organic electrosynthesis: basic principles and recent developments.

Robert Francke1, R Daniel Little

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Mediated electroorganic synthesis offers an environmentally friendly alternative for chemical oxidation and reduction. Advances in redox mediators improve efficiency, selectivity, and reduce side reactions in indirect electrolysis.

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Area of Science:

  • Electroorganic Synthesis
  • Green Chemistry
  • Electrocatalysis

Background:

  • Electroorganic synthesis provides a sustainable alternative to traditional organic synthesis methods.
  • Indirect electrolysis using redox mediators offers significant advantages over direct electrolysis.
  • Mediated electron transfer overcomes limitations like kinetic inhibitions and electrode passivation.

Purpose of the Study:

  • To review recent advancements in electroorganic synthesis, focusing on the role of redox mediators.
  • To highlight the benefits and expanding applications of mediated electroorganic synthesis.
  • To discuss the development of novel redox mediators and advanced reaction protocols.

Main Methods:

  • Review of recent literature on electroorganic synthesis and redox mediator development.
  • Analysis of new protocols, including double mediatory systems, enantioselective mediation, and heterogeneous electrocatalysis.
  • Incorporation of computational tools for efficient and targeted design of redox mediators.

Main Results:

  • Mediated electron transfer enables reactions against a potential gradient, requiring lower potentials and reducing side reactions.
  • Development of new redox mediators and protocols like biphasic systems, enantioselective mediation, and immobilized mediators.
  • Enhanced understanding of mediated electron transfer reaction mechanisms.

Conclusions:

  • Electroorganic synthesis with redox mediators is a rapidly advancing and environmentally benign field.
  • Continued innovation in mediator design and reaction protocols promises further improvements in efficiency and selectivity.
  • Mediated electroorganic synthesis is crucial for sustainable chemical transformations.