反应详情

温度

5 °C

60 g of rutin are suspended in 6 l of demineralized wazer and, at 100° C., firstly 210 ml of 32% strength aqueous sodium hydroxide solution and then 600 g of sodium dithionite are added thereto. The mixture is then refluxed for a further 12 h with stirring, and the suspension is cooled to 5° C., slowly neutralized with 195 ml of fuming hydrochloric acid and stirred for 1 h at 0° C. Customary work-up gives 23.3 g of crude luteolin with a purity of 96.5%. Further purification and drying produces 20.9 g of luteolin with a purity of 99.6%.

1. customare suspended in 6 l of demineralized wazer and, at 100° C.
2. temperatureThe mixture is then refluxed for a further 12 h
3. stirringstirred for 1 h at 0° C