Bulletin of the Chemical Society of Japan p. 295 - 297 (1992)
Update date:2022-09-26
Topics:
Matsunaga, Yoichiro
Imafuku, Kimiaki
Treatments of 3-isopropenyltropolone with quarternary ammonium tribromides in tetrahydrofuran afforded 3-methyl-8H-cycloheptafuran-8-one.The reactions in methanol-dichloromethane gave 7-bromo-3-methyl-8H-cycloheptafuran-8-one.Bromination of 3-acetyltropolone with the tribromides in tetrahydrofuran produces 3-(bromoacetyl)-tropolone, while the reaction in the methanolic solvent gave 7-bromo- and 5,7-dibromo-substituted 3-acetyltropolones.The brominations of 4'-hydroxyacetophenone were also carried out.
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