2-bromo-5-fluoro-1-oxidopyridin-1-ium

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Prepared analogously to example 83b from 2-bromo-5-fluoropyridine 1-oxide, conc. sulphuric acid and conc. nitric acid

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 2-Bromo-5-fluoropyridine (15 g, 85.6 mmol), trifluoroacetic acid (70 mL, 908 mmol) and hydrogen peroxide (35% in water) (9 mL, 105 mmol) were stirred overnight at 70° C. The mixture was poured into water and extracted with dichloromethane. The organic layers were washed with NaHCO3 (aq), dried over MgSO4 and the solvent was removed i.vac. extracted with dichloromethane The organic layers were washed with NaHCO3 (aq) dried over MgSO4 the solvent was removed i.vac