Bromine → 6-bromo-7,8-dihydro-5(6H)-quinolinone hydrobromide

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To a warm solution of 5.00 g (33.52 mmol) of 7,8-dihydro-5(6H)-quinolinone, prepared in Example 1, in 25 ml of 48% hydrobromic acid, was added dropwise 6.0 g (37.54 mmol) of bromine. The solution was stirred at room temperature for 1 hour, then concentrated to a yellow-white solide. Recrystallization from absolute ethanol afforded 9.20 g (88.5%) of 6-bromo-7,8-dihydro-5(6H)-quinolinone hydrobromide as a white solid; mp 187°-189° C. (dec.).

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