KBrO4 + 2AsF5 + 3HF → BrO3F + [H3O][AsF6] + K[AsF6]
Potassium perbromate react with arsenic(V) fluoride and hydrogen fluoride to produce bromine fluoride-trioxide, hydronium hexafluoroarsenate(V) and potassium hexafluoroarsenate(V). The reaction is conducted in a liquid ammonia.