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Xavier Marset1, Beatriz Saavedra1, Nerea González-Gallardo1

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Frontiers in Chemistry
|November 12, 2019
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Summary

A novel mesoionic carbene ligand enhances palladium-catalyzed cross-coupling reactions in Deep Eutectic Solvents. This system demonstrates high activity, enabling reactions at room temperature using aryl chlorides.

Keywords:
Deep Eutectic Solventcross-coupling reactionmesoionic carbenepalladiumsustainability

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Area of Science:

  • Organic Chemistry
  • Catalysis
  • Green Chemistry

Background:

  • Mesoionic carbenes (MICs) are versatile ligands in catalysis.
  • Deep Eutectic Solvents (DES) offer sustainable reaction media.
  • Palladium-catalyzed cross-coupling reactions are vital in organic synthesis.

Purpose of the Study:

  • To synthesize and evaluate a strong σ-donor mesoionic carbene ligand.
  • To investigate its application in palladium-catalyzed cross-coupling reactions within Deep Eutectic Solvents.
  • To explore the potential for multistep synthesis in DES.

Main Methods:

  • Synthesis of a novel mesoionic carbene ligand.
  • Application of the ligand in four palladium-catalyzed cross-coupling reactions.
  • Utilizing Deep Eutectic Solvents as the reaction medium.
  • Analysis of reaction conditions, including room temperature and aryl chloride substrates.
  • Evaluation of palladium nanoparticle formation and its correlation with catalytic activity.

Main Results:

  • The synthesized mesoionic carbene ligand demonstrated high catalytic activity in palladium-catalyzed cross-coupling reactions.
  • The catalyst/medium system showed compatibility with Deep Eutectic Solvents.
  • Reactions were successfully performed at room temperature using challenging aryl chloride starting materials.
  • The feasibility of multistep synthesis in eutectic mixtures was demonstrated.
  • Palladium nanoparticle formation was observed and linked to enhanced catalytic performance.

Conclusions:

  • The novel mesoionic carbene ligand is effective for palladium-catalyzed cross-coupling in Deep Eutectic Solvents.
  • This system offers improved activity and milder reaction conditions compared to previous methods.
  • The developed methodology supports sustainable synthesis strategies and the use of aryl chlorides.