The reaction of 2-methoxytropone and its bromo derivatives with bromine was examined in various solvents. The treatment of 2-methoxytropone or 5-bromo-2-methoxytropone with bromine in methanol gave an addition product, 2, 6-dibromo-7, 7-dimethoxy-(II) or 2, 4, 6- tribromo-7, 7-dimethoxy-2, 4-cycloheptadien-1-one (XIV) respectively, together with the substitution products. On the contrary, the treatment of 2-methoxytropone with bromine in ...
