Реакция #487509

Уравнение реакции

sulfuric acid

sulfuric acid

alizarin

→

purpurin

Растворители

water

water

Условия реакции

Обработка

1. 1
   Другоеhad been prepared
2. 2
   Температураcooling
3. 3
   workup.ADDITIONwas added over 1 hour to a reaction liquid
4. 4
   Другоеthe reaction liquid
5. 5
   Промывкаbeing washed with 400 mL of water
6. 6
   Фильтрацияfiltered
7. 7
   ФильтрацияThe crystal collected by filtration
8. 8
   Промывкаwas washed with 300 mL of methanol
9. 9
   Другоеdried

Методика

A suspension of 17.5 g of manganese dioxide/40 g of concentrated sulfuric acid, that had been prepared by putting 9.0 g of water and 130 g of 96% sulfuric acid into 30 g of alizarin (manufactured by Sigma-Aldrich Corporation), followed by ice-cooling, was added over 1 hour to a reaction liquid while maintaining it at 10° C. or lower. After 2 hours, the reaction liquid was poured into 1 L of water, with the inside of the container being washed with 400 mL of water, and filtered. The crystal collected by filtration was washed with 300 mL of methanol and dried to obtain 32.4 g of purpurin.

Источник