title: The perchloric acid catalyzed acetic anhydride enol acetylation of steroidal delta 4-3 ketones.
mesh_terms: D000731:Androstanes / Q000138:chemical synthesis* / Q000302:isolation & purification; D000812:Anhydrides; D002384:Catalysis; D007659:Ketones; D010472:Perchlorates; D013057:Spectrum Analysis
chemical_list: D000731:Androstanes; D000812:Anhydrides; D007659:Ketones; D010472:Perchlorates