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Novel process for generating useful electrophiles from common anions using Selectfluor fluorination agent.

Robert G Syvret1, Kathleen M Butt, Tung P Nguyen

  • 1Fluorine Technology Center, Air Products and Chemicals, Inc., 7201 Hamilton Blvd., Allentown, Pennsylvania 18195, USA. syvretrg@apci.com

The Journal of Organic Chemistry
|June 22, 2002
PubMed
Summary

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This study introduces a novel method for generating electrophile equivalents like Cl+, Br+, SCN+, and NO2+ using Selectfluor. These species efficiently react with diverse aromatic compounds, yielding high-purity substitution products.

Area of Science:

  • Organic Chemistry
  • Synthetic Chemistry

Background:

  • Electrophilic aromatic substitution is a fundamental reaction in organic chemistry.
  • Generating reactive electrophile equivalents often requires specialized reagents or conditions.

Purpose of the Study:

  • To develop a convenient and efficient method for generating electrophile equivalents (Cl+, Br+, SCN+, NO2+).
  • To investigate the in situ reaction of these electrophiles with various substituted aromatic substrates.

Main Methods:

  • Generation of electrophile equivalents from sodium, potassium, or ammonium salts using Selectfluor in acetonitrile.
  • In situ reaction of generated electrophiles with aromatic substrates bearing diverse substituents.
  • Isolation and purification of the resulting substitution products.

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Main Results:

  • Successful generation of Cl+, Br+, SCN+, and NO2+ equivalents.
  • High yields of isolable pure substitution products obtained from a wide range of aromatic substrates.
  • Demonstrated versatility with various substituent groups on the aromatic rings.

Conclusions:

  • The described method provides a facile route to electrophile equivalents for aromatic substitution.
  • The process is efficient, scalable, and yields high-purity products.
  • Potential for further optimization by varying anions, fluorinating agents, and solvents.