反应详情

41.4 ml of fuming nitric acid was slowly added to 500 ml of acetic acid under ice-cooling, followed by stirring for 10 minutes, and a solution of 78 ml of acetic acid anhydride containing 50 g of 3,4-dibromothiophene was slowly added, followed by stirring at room temperature for 18 hours. Ice was added to the reaction solution, and the resulting crystals were collected by filtration, and washed with water and diethyl ether/n-hexane=1/5 successively, to give 40.2 g of the title compound.

1. temperaturecooling
2. stirringby stirring at room temperature for 18 hours
3. additionIce was added to the reaction solution
4. filtrationthe resulting crystals were collected by filtration
5. washwashed with water and diethyl ether/n-hexane=1/5 successively