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Radical Reactivity: Overview01:11

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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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The presence of electron-donating, electron-withdrawing, or conjugating groups adjacent to a radical center, imparts electronic stabilization to the radicals. Examples of such electronically-stabilized radicals are triphenylmethyl, tetramethylpiperidine‐N‐oxide, and 2,2‐diphenyl‐1‐picrylhydrazyl. These radicals are remarkably stable and are known as persistent radicals. Some of the persistent radicals can even be isolated and purified.
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Radical Reactivity: Nucleophilic Radicals01:16

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Radicals adjacent to electron-donating groups are called nucleophilic radicals. These radicals readily react with electrophilic alkenes. The SOMO–LUMO interactions are the driving force for the reaction, where the high-energy SOMO of the electron-rich, nucleophilic radicals interacts with the low-energy LUMO of the electron-deficient, electrophilic alkenes. Such SOMO–LUMO interactions are the basis of reactive radical traps, affecting the selectivity in radical reactions. For...
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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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Sequential radical and cationic reactivity at separated sites within one molecule in solution.

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Researchers isolated novel crystalline distonic radical cations (DRCs) exhibiting unique dual reactivity. These compounds display sequential radical and cationic behavior at spatially separated sites in solution.

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Area of Science:

  • Organic Chemistry
  • Supramolecular Chemistry
  • Physical Chemistry

Background:

  • Distonic radical cations (DRCs) possess spatially separated charge and radical sites, theoretically enabling dual reactivity.
  • Observation of this dual reactivity in the condensed phase has been rare, limiting understanding of their chemical behavior.

Purpose of the Study:

  • To report the isolation and characterization of novel crystalline DRCs.
  • To investigate the unique reactivity of these spatially separated charge and radical sites.
  • To differentiate the behavior of these DRCs from conventional radical cations (CRCs).

Main Methods:

  • Crystallographic analysis to determine molecular structure.
  • Spectroscopic techniques (e.g., NMR, EPR) for characterization.
  • Computational chemistry to understand electronic structure and stabilization.

Main Results:

  • Isolation and full characterization of crystalline 1λ2,3λ2-1-phosphonia-3-phosphinyl-cyclohex-4-enes (2a,b˙+).
  • These compounds are identified as delocalized DRCs with stabilized, spatially separated radical (7 valence electrons) and cationic (6 valence electrons) sites.
  • Demonstrated sequential radical and cationic reactivity at distinct molecular sites in solution.

Conclusions:

  • Successfully isolated and characterized novel crystalline DRCs with separated radical and cationic centers.
  • These DRCs exhibit distinct reactivity patterns compared to conventional radical cations.
  • The findings open new avenues for exploring dual reactivity in condensed-phase systems.