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Radicals adjacent to electron‐withdrawing groups are called electrophilic radicals. These radicals readily react with nucleophilic alkenes. For example, the malonate radical, in which the radical center is flanked by two electron‐withdrawing groups, reacts readily with butyl vinyl ether, which consists of an electron‐donating oxygen substituent. The reaction between electrophilic malonate radical and nucleophilic vinyl ether is favored because the radical has a...
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This lesson delves into the geometry of a radical, which is influenced by the electronic structure of the molecule. The principle is similar to that of a lone pair, where the unpaired electron influences the geometry at the radical center.
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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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Aromatic Hydrocarbon Anions: Structural Overview01:18

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Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
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Atom Transfer Radical Polymerization of Functionalized Vinyl Monomers Using Perylene as a Visible Light Photocatalyst
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A crystalline phosphaalkene radical anion.

Xiaobo Pan1, Xingyong Wang, Yue Zhao

  • 1State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, and ‡Centre of Modern Analysis, Nanjing University , Nanjing 210093, China.

Journal of the American Chemical Society
|July 1, 2014
PubMed
Summary
This summary is machine-generated.

Researchers have synthesized and characterized novel phosphaalkene radical anions, revealing spin density primarily on phosphorus atoms. This breakthrough marks the first isolation of crystalline phosphaalkene radical anions.

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Area of Science:

  • Organophosphorus chemistry
  • Radical anion chemistry
  • Materials science

Background:

  • Phosphaalkenes are unsaturated compounds containing a phosphorus-carbon double bond.
  • Radical anions are species with an unpaired electron and a negative charge, often exhibiting unique reactivity.
  • Isolation and characterization of stable radical anions are crucial for understanding electron transfer processes and developing new materials.

Purpose of the Study:

  • To synthesize and characterize novel phosphaalkene radical anions.
  • To investigate the electronic structure and spin distribution within these radical anions.
  • To establish the first crystalline form of a phosphaalkene radical anion.

Main Methods:

  • Isolation of salts containing phosphaalkene radical anions.
  • Electron paramagnetic resonance (EPR) spectroscopy for radical characterization.
  • UV-vis absorption spectroscopy for electronic transitions.
  • Single-crystal X-ray diffraction for structural determination.
  • Theoretical calculations for spin density analysis.

Main Results:

  • Successful isolation and characterization of phosphaalkene radical anions.
  • Structural analysis revealed elongated P-C bonds and fulvene aromatization compared to neutral precursors.
  • EPR spectroscopy and theoretical calculations confirmed that spin density is predominantly localized on the phosphorus atoms.
  • The study reports the first crystalline phosphaalkene radical anion.

Conclusions:

  • Phosphaalkene radical anions can be isolated as stable crystalline salts.
  • The electronic structure involves significant delocalization with spin density centered on phosphorus.
  • This work opens new avenues for exploring the chemistry and applications of phosphorus-based radical anions.