تفاعل #487509

معادلة التفاعل

sulfuric acid

sulfuric acid

alizarin

→

purpurin

المذيبات

water

water

ظروف التفاعل

المعالجة

1. 1
   أخرىhad been prepared
2. 2
   درجة الحرارةcooling
3. 3
   workup.ADDITIONwas added over 1 hour to a reaction liquid
4. 4
   أخرىthe reaction liquid
5. 5
   غسيلbeing washed with 400 mL of water
6. 6
   ترشيحfiltered
7. 7
   ترشيحThe crystal collected by filtration
8. 8
   غسيلwas washed with 300 mL of methanol
9. 9
   أخرىdried

الإجراء التجريبي

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.

المصدر