反应详情

150 g of dibenzofuran (892 millimoles) and 1 liter of acetic acid were placed in a flask, which was then replaced with nitrogen and the contents of which were dissolved under heating. After 188 g of bromine (1.18 moles) were dropped while being occasionally cooled with water, the mixture was stirred for 20 hours under cooling with air. The precipitated crystals were filtrated, washed sequentially with acetic acid and water, and dried under reduced pressure. After the crystals obtained were purified by distillation under reduced pressure, recrystallization from methanol was performed several times to obtain 66.8 g of 2-bromodibenzofuran (yield 31%). The resultant was identified as Intermediate 4 by FD-MS analysis.

1. dissolutionthe contents of which were dissolved
2. temperatureunder heating
3. temperatureunder cooling with air
4. filtrationThe precipitated crystals were filtrated
5. washwashed sequentially with acetic acid and water
6. customdried under reduced pressure
7. customAfter the crystals obtained
8. distillationwere purified by distillation under reduced pressure, recrystallization from methanol