Sulfuric Acid → Acenaphtho[1,2-b]quinoxaline-2-sulfonic acid

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반응 단계

As represented by the following reaction pathway, 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 48 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 to obtain acenaphtho[1,2-b]quinoxaline-2-sulfonic acid as represented by the following formula (d).

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