反应详情

As represented by the following reaction pathway, after 30% fuming sulfuric acid (2.1-liter) was added to 300 g of acenaphtho[1,2-b]quinoxaline obtained by synthesis example 1 and the mixture was stirred at room temperature for 24 hours, the resultant was heated to 130° C. and stirred for 32 hours for reaction. While keeping the obtained solution at 40° C. to 50° C., 4.5-liter of ion exchange water was added for dilution, and the resultant was further stirred for 3 hours. The precipitate was filtered and recrystallized with sulfuric acid to obtain acenaphtho[1,2-b]quinoxaline-2,5-disulfonic acid as represented by the following formula (c).

1. customAs represented by the following reaction pathway
2. customobtained by synthesis example 1
3. temperaturethe resultant was heated to 130° C.
4. stirringstirred for 32 hours for reaction
5. customat 40° C. to 50° C.
6. stirringthe resultant was further stirred for 3 hours
7. filtrationThe precipitate was filtered
8. customrecrystallized with sulfuric acid