反应详情

To a mixed solution of acetic acid (20 ml) and 47% hydrobromic acid (10 ml), 2,3,6,7-tetramethoxyfluorenone (8.0 g) was added and the mixture was refluxed for 15 hours. After cooling, the precipitated crystals were filtered, washed with water and then recrystallized from water-containing ethanol to give 5.0 g of 2,3,6,7-tetrahydroxyfluorenone as a claret powder.

1. temperaturethe mixture was refluxed for 15 hours
2. temperatureAfter cooling
3. filtrationthe precipitated crystals were filtered
4. washwashed with water
5. customrecrystallized from water-
6. additioncontaining ethanol