反应详情

To a 3 L 3-necked flask containing 60 g of phenolphthalein (A), 450 ml of water and 525 ml of ethanol was added 450 mL of 50% sodium hydroxide solution in ethanol and 300 g of zinc powder. The contents were heated to reflux and maintained at that temperature for 12 hrs. The solution was cooled to room temperature, filtered and acidified until phenolphthalin precipitated as a white powder. This was collected by filtration and dried at 80° C. for 24 hrs at reduced pressure. Yield=95%. m.p.=234°-236° C.

1. temperatureThe contents were heated
2. temperatureto reflux
3. temperaturemaintained at that temperature for 12 hrs
4. filtrationfiltered
5. customprecipitated as a white powder
6. filtrationThis was collected by filtration
7. customdried at 80° C. for 24 hrs at reduced pressure