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The Trifluoromethyl Anion.

Anton Lishchynskyi1, Fedor M Miloserdov1, Eddy Martin1

  • 1Institute of Chemical Research of Catalonia (ICIQ), Avgda. Països Catalans 16, 43007 Tarragona (Spain).

Angewandte Chemie (International Ed. in English)
|October 27, 2015
PubMed
Summary

Researchers have discovered the first evidence of the free trifluoromethyl anion (CF3⁻). This "naked" anion, stabilized by a bulky potassium cation, opens new avenues in chemical synthesis.

Keywords:
NMR spectroscopyX-ray diffractioncarbanionstrifluoromethyl aniontrifluoromethylation

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Area of Science:

  • Chemistry
  • Inorganic Chemistry
  • Fluorine Chemistry

Background:

  • The trifluoromethyl group (CF3) is a crucial moiety in pharmaceuticals and materials science.
  • Stabilizing highly reactive species like anions is essential for their isolation and study.

Purpose of the Study:

  • To provide the first experimental evidence for the existence of a free trifluoromethyl anion (CF3⁻).
  • To characterize the properties and reactivity of this novel anionic species.

Main Methods:

  • Single-crystal X-ray diffraction to determine the structure of the ionic compound.
  • Solution Nuclear Magnetic Resonance (NMR) spectroscopy for structural and electronic analysis.
  • Density Functional Theory (DFT) calculations to model the electronic structure and properties.
  • Reactivity studies with various electrophiles.

Main Results:

  • Successful isolation and characterization of the ionic compound [K(crypt-222)]⁺CF3⁻.
  • Demonstration that the bulky [K(crypt-222)]⁺ cation effectively shields the CF3⁻ anion, rendering it uncoordinated or "naked".
  • Confirmation of the anion's existence and structure through spectroscopic and crystallographic data.
  • Initial reactivity studies showing the anion's behavior towards electrophilic reagents.

Conclusions:

  • The study presents the first definitive evidence for the free trifluoromethyl anion (CF3⁻).
  • The "naked" CF3⁻ anion can be stabilized and characterized, expanding the scope of organofluorine chemistry.
  • This discovery provides a new reactive intermediate for synthetic applications, particularly in the introduction of the CF3 group.