反应详情

温度

5 °C

To a suspension of 1,5-dihydroxyanthraquinone (10 g, 41.6 mmole) and stannous chloride (45 g, 237 mmole) in glacial acetic acid (150 ml), conc. hydrochloric acid (90 ml) was added at 16°-20° C. The resulting mixture was stirred for 4 hours under reflux. After standing at room temperature overnight, the reaction mixture was cooled to 5° C. A precipitate was filtered, washed with H2O and dried to afford 8.0 g of 1,5-dihydroxyanthrone as dark brown needles having a m.p. of 231°-233° C.

1. additionwas added at 16°-20° C
2. temperatureunder reflux
3. waitAfter standing at room temperature overnight
4. filtrationA precipitate was filtered
5. washwashed with H2O
6. customdried