反应详情

As represented by the following reaction formula (VIII), 30% fuming sulfuric acid (2.1 L) was added to 300 g of acenaphtho[1,2-b]quinoxaline and the mixture was stirred at room temperature for 48 hours for reaction. While keeping the obtained solution at 40° C. to 50° C., 4.5 L of ion exchange water was added for dilution, and the resultant was further stirred for 3 hours. The precipitate was filtered and, after being washed with 1 L of acetone for three times, the resultant was filtered and subjected to vacuum drying at 60° C. for 12 hours to obtain acenaphtho[1,2-b]quinoxaline-2-sulfonic acid.

1. customat 40° C. to 50° C.
2. stirringthe resultant was further stirred for 3 hours
3. filtrationThe precipitate was filtered
4. washafter being washed with 1 L of acetone for three times
5. filtrationthe resultant was filtered
6. customdrying at 60° C. for 12 hours