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Orthogonal Nanoparticle Catalysis with Organogermanes.

Christoph Fricke1, Grant J Sherborne1, Ignacio Funes-Ardoiz1

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|September 29, 2019
PubMed
Summary

Palladium nanoparticles enable unique cross-coupling reactions with aryl germanes, outperforming traditional catalysts. This offers a stable, air-tolerant method for synthesizing complex biaryl compounds.

Keywords:
catalysischemoselectivitydensity functional calculationsgermaniumnanoparticles

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Area of Science:

  • Catalysis
  • Organic Chemistry
  • Materials Science

Background:

  • Nanoparticles are common catalysts, but their unique reactivity compared to molecular or bulk heterogeneous catalysts is not well understood.
  • Palladium nanoparticle catalysis offers potential for novel chemical transformations.

Purpose of the Study:

  • To investigate the orthogonal reactivity of palladium nanoparticles in cross-coupling reactions.
  • To demonstrate the utility of aryl germanes as coupling partners under nanoparticle catalysis.

Main Methods:

  • Cross-coupling reactions using palladium nanoparticles and aryl germanes.
  • Comparison with traditional homogeneous (Ln Pd0 /Ln PdII) catalysis.
  • Mechanistic and computational studies.

Main Results:

  • Palladium nanoparticles exhibit orthogonal reactivity compared to molecular catalysts in aryl halide/aryl germane cross-coupling.
  • Aryl germanes are highly reactive under nanoparticle conditions, outcompeting established coupling partners like ArBPin and ArBMIDA.
  • This method allows for air-tolerant, base-free synthesis of biaryl motifs.
  • Stable aryl germanes, including those derived from polyfluoroaryl and 2-pyridyl groups, are readily coupled.

Conclusions:

  • Palladium nanoparticles provide a distinct catalytic pathway for cross-coupling reactions.
  • Aryl germanes are superior coupling partners under nanoparticle catalysis, enabling efficient biaryl synthesis.
  • The enhanced reactivity is attributed to the electron richness of aryl germanes and their preferential reaction via electrophilic aromatic substitution with electrophilic nanoparticles.