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Radical Reactivity: Concentration Effects01:20

Radical Reactivity: Concentration Effects

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In a radical reaction, the concentration of starting materials governs the selectivity of a radical. For example, the reaction between an alkyl halide and an alkene, in the presence of tin hydride and AIBN, begins with the generation of a tin radical. The generated radical then abstracts halogen from the alkyl halide, producing an alkyl radical. This alkyl radical can either react with tin hydride, yielding an alkane, or add to an alkene, generating a nitrile-stabilized radical, eventually...
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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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Radical Reactivity: Nucleophilic Radicals01:16

Radical Reactivity: Nucleophilic Radicals

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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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In organic synthesis, the formation of products can be altered by changing the reaction conditions. For example, a dibromo addition product is formed when propene is treated with bromine at room temperature. In contrast, propene undergoes allylic substitution in non-polar solvents at high temperatures to give 3-bromopropene. In order to avoid the addition reaction, the bromine concentration must be kept as low as possible throughout the reaction. This can be achieved using N-bromosuccinimide...
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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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Atom Transfer Radical Polymerization of Functionalized Vinyl Monomers Using Perylene as a Visible Light Photocatalyst
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Aryl Radical Selectivity in Biphasic Systems.

Lisa-Marie Altmann1, Michael C D Fürst1, Eva I Gans1

  • 1Department of Chemistry and Pharmacy, Pharmaceutical Chemistry , Friedrich-Alexander-Universität Erlangen-Nürnberg , Nikolaus-Fiebiger-Strasse 10 , 91058 Erlangen , Germany.

Organic Letters
|January 7, 2020
PubMed
Summary
This summary is machine-generated.

Aryl radicals prefer reacting in the aqueous phase of biphasic systems, even with low polarity. They do not transfer to lipophilic phases, regardless of surfactants, crucial for biological system studies.

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Area of Science:

  • Organic Chemistry
  • Physical Chemistry
  • Chemical Kinetics

Background:

  • Biphasic mixtures involve distinct aqueous and lipophilic phases.
  • Understanding radical behavior in compartmentalized systems is key for complex environments.
  • Aryl radicals are important intermediates in various chemical reactions.

Purpose of the Study:

  • To investigate the phase preference of aryl radicals in biphasic mixtures.
  • To determine the influence of polarity and surfactants on aryl radical partitioning.
  • To establish a foundation for studying radical reactions in biological systems.

Main Methods:

  • Generation of aryl radicals in aqueous phase of biphasic mixtures.
  • Analysis of radical reaction products in both aqueous and lipophilic phases.
  • Varying system polarity and surfactant presence to observe partitioning behavior.

Main Results:

  • Aryl radicals exhibit a strong preference for reacting within the aqueous phase.
  • Phase transfer into the lipophilic phase was not observed, irrespective of surfactant presence.
  • The observed behavior was consistent despite the comparably low polarity of the aqueous phase.

Conclusions:

  • Aryl radicals remain localized in the aqueous phase of biphasic systems.
  • Surfactants do not induce significant phase transfer of aryl radicals to lipophilic environments.
  • These findings are critical for future research on radical reactions in biologically relevant compartmentalized systems.