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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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This study investigates why different cyanoarenes yield varying results in photoredox catalysis. We found that cyanoarene radical anion stability directly impacts product yield, revealing a key factor in controlling these reactions.

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Area of Science:

  • Organic Chemistry
  • Photocatalysis
  • Reaction Mechanism

Background:

  • Photoredox catalysis uses visible light to drive organic synthesis via radical ions.
  • Cyanoarenes are common arylating agents due to stable radical anions.
  • Unexplained yield variations exist when using different cyanoarenes.

Purpose of the Study:

  • To characterize quantum and product yields in an α-aminoarylation reaction.
  • To investigate the cause of yield discrepancies with various cyanoarenes.
  • To understand the role of cyanoarene radical anion stability in reaction outcomes.

Main Methods:

  • Characterization of quantum yield and product yield for five cyanoarene coupling partners.
  • Analysis of side products to identify unproductive reaction pathways.
  • Electrochemical and computational studies of cyanoarene radical anion fragmentation.
  • Kinetic modeling to elucidate cross-coupling selectivity.

Main Results:

  • Significant variations in cyanoarene consumption and product yield were observed.
  • Radical anion fragmentation was identified as an unproductive pathway.
  • A direct correlation was found between product yield and cyanoarene radical anion stability.
  • Kinetic modeling indicated the persistent radical effect governs cross-coupling selectivity.

Conclusions:

  • Cyanoarene radical anion stability is a critical determinant of product yield in photoredox α-aminoarylation.
  • Radical anion fragmentation represents a significant unproductive pathway.
  • The persistent radical effect influences cross-coupling selectivity in these reactions.