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Tropolone[1] IUPAC name 2-Hydroxy-2,4,6-cycloheptatrien-1-one Other names 2-Hydroxytropone; Purpurocatechol Identifiers CAS number 533-75-5 Y PubChem 10789 SMILES   C1=CC=C(C(=O)C=C1)O Properties Molecular formula C7H6O2 Molar mass 122.12 g/mol Melting point 50-52 °C Boiling point 80-84 °C (0.1 mmHg) Hazards S-phrases S22 S24/25 Flash point 112 °C Related compounds Related compounds Hinokitiol (4-isopropyl-tropolone)  Y (what is this?)  (verify) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox references Tropolone is a derivative of tropone with a hydroxyl group in the 2-position. Two methods for the synthesis of tropolone are by bromination of 1,2-cycloheptanedione with N-bromosuccinimide followed by dehydrohalogenation at elevated temperatures and by acyloin condensation of the ethyl ester of pimelic acid the acyloin again followed by oxidation by bromine. References ^ Tropolone at Sigma-Aldrich