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The Tris(pentafluorophenyl)methylium Cation: Isolation and Reactivity.

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Researchers synthesized the stable perfluorinated trityl cation, enabling its handling in organic solvents. This breakthrough allows detailed characterization and reveals the cation

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Area of Science:

  • Organometallic Chemistry
  • Fluorine Chemistry

Background:

  • The perfluorinated trityl cation is a highly reactive species.
  • Handling free, uncoordinated perfluorinated trityl cation in organic solvents has been challenging.

Purpose of the Study:

  • To develop synthetic routes for the perfluorinated trityl cation.
  • To characterize the free, uncoordinated perfluorinated trityl cation.
  • To investigate the reactivity and oxidative potential of the perfluorinated trityl cation.

Main Methods:

  • Synthesis of perfluorinated trityl cation using two novel routes.
  • Characterization using NMR spectroscopy and single-crystal X-ray diffraction.
  • Hydride ion affinity determined by hydrogen abstraction from isobutane.
  • Oxidative potential assessed via cyclic voltammetry and reaction with tris(4-bromophenyl)amine.

Main Results:

  • Successful synthesis and isolation of the free, uncoordinated perfluorinated trityl cation in organic solvents.
  • Detailed structural and spectroscopic characterization of the cation.
  • Demonstrated high hydride ion affinity and significant oxidative potential.
  • Formation of the "magic blue" ammoniumyl radical cation.

Conclusions:

  • The development of new synthetic routes has enabled the study of the uncoordinated perfluorinated trityl cation.
  • The cation exhibits high reactivity, including strong hydride abstraction capabilities.
  • This work provides fundamental insights into the chemistry of highly electrophilic perfluorinated species.