A new chromium(VI) reagent, 3,5-dimethylpyrazolium fluorochromate, C 5 H 8 N 2 H[CrO 3 F] (DmpzHFC), has been developed by reacting dmpz with CrO 3 and aqueous HF for the selective oxidation of primary, secondary and allylic alcohols to the corresponding carbonyl compounds, polycyclic hydrocarbons to cyclic ketones and allylic Δ 5 -steroids to the corresponding α,β-unsaturated ketones.