反应详情

A mixture of 10 g of 1-chloro-7-methoxy-4-nitro-9H-xanthen-9-one and 84 ml of a 1M solution of boron tribromide in dichloromethane in 280 ml of dichloromethane was stirred at room temperature under an argon atmosphere for 16 hours, and then it was treated with 100 ml of methanol, and stirred for three hours. The mixture was filtered to give a light green solid. Recrystallization from chloroformmethanol afforded the title compound, mp 290°-292° C.

1. stirringstirred for three hours
2. filtrationThe mixture was filtered
3. customto give a light green solid
4. customRecrystallization from chloroformmethanol