反应详情

To a solution of 5,6-dihydroxy-3H-isobenzofuran-1-one (0.4 g) in sulfuric acid at −30° C. was added 5 M nitric acid in sulfuric acid (0.55 ml). The reaction mixture was let to warm up to room temperature and then poured into ice water. The product was filtered and recrystallized from acetic acid.

1. filtrationThe product was filtered
2. customrecrystallized from acetic acid