C(OC([N:6]1[CH2:14][C:13]2[C:8](=[CH:9][CH:10]=[CH:11][C:12]=2[N+:15]([O-:17])=[O:16])[CH2:7]1)=O)C.[BrH:18]>C(O)(=O)C>[BrH:18].[N+:15]([C:12]1[CH:11]=[CH:10][CH:9]=[C:8]2[C:13]=1[CH2:14][NH:6][CH2:7]2)([O-:17])=[O:16]2.36 g of 2-ethoxycarbonyl-4-nitroisoindoline was added to 70 ml of 25% hydrobromic acid in acetic acid. The mixture was stirred for 20 hours at 100° C., concentrated under reduced pressure, and recrystallized from ethanol to give 2.11 g of 4-nitroisoindoline hydrobromide.
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