title: Preparation and properties of some benzotropylium perchlorates.
mesh_terms: D003508:Cycloheptanes / Q000138:chemical synthesis*; D009682:Magnetic Resonance Spectroscopy; D008738:Methyl Ethers / Q000138:chemical synthesis; D010472:Perchlorates / Q000138:chemical synthesis; D013055:Spectrophotometry, Infrared; D013056:Spectrophotometry, Ultraviolet
chemical_list: D003508:Cycloheptanes; D008738:Methyl Ethers; D010472:Perchlorates