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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...
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Typically, when alkenes react with halogens at low temperatures, an addition reaction occurs. However, upon increasing the temperature or under reaction conditions that form radicals, providing a low but steady concentration of halogen radicals, allylic substitution reaction is favored. This is because allylic hydrogens are very reactive as the formed intermediate is resonance stabilized. For example, when propene is treated with chlorine in the gas phase at 400 °C, it undergoes allylic...
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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...
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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
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Thermally Driven Diselenide Metathesis: Polarization Process vs Radical Process.

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This study reveals a new polarization-induced mechanism for diselenide exchange reactions, demonstrating it

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Area of Science:

  • Materials Science
  • Organic Chemistry
  • Polymer Science

Background:

  • Diselenides are dynamic covalent bonds utilized in functional materials due to their responsiveness to various stimuli.
  • Understanding the fundamental mechanisms governing diselenide exchange is crucial for designing advanced materials.

Purpose of the Study:

  • To propose and validate a novel polarization-induced metathesis mechanism for diselenide exchange reactions under thermal conditions in the dark.
  • To elucidate the role of polarity in diselenide bond dynamics.

Main Methods:

  • Radical trap experiments to investigate reaction pathways.
  • Systematic variation of solvent polarity and molecular structure.
  • Density Functional Theory (DFT) calculations to analyze bond dissociation energies.
  • Experimental validation using allyl selenide small molecules, polymers, and polymer materials.

Main Results:

  • The diselenide exchange reaction in the dark proceeds via a non-radical pathway.
  • Solvent polarity and the presence of polar molecular groups significantly influence the dynamic exchange reaction.
  • DFT calculations confirm that polarity preferentially affects heterolytic bond dissociation.
  • Experimental data across various molecular systems support the proposed polarization-induced metathesis mechanism.

Conclusions:

  • A polarization-induced metathesis mechanism explains diselenide exchange in the dark, distinct from radical pathways.
  • This finding enhances the fundamental understanding of diselenide chemistry and its application in materials science.