Schiemann Reaction: Diazonium Tetrafluoroborates → Aryl Fluorides

Learn the Schiemann reaction: forming aryl diazonium tetrafluoroborate salts and thermally decomposing to aryl fluorides. Scope and safety notes.

  • Reaction: Ar–N2+ BF4− → Ar–F + N2
  • What it does: Introduces fluorine onto aromatic rings
  • Typical reagents: HBF4 to form diazonium BF4−; heat
  • Key intermediate: Diazonium tetrafluoroborate
  • Driving force: Loss of N2 gas
  • Exam type: Synthesis planning
  • Exam type: Predict product

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