反应详情

A solution of 2-[(methylsulfinyl)methyl]-4H-1-benzopyran-4-one (2.22 g, 0.01 m) in acetic anhydride (15 ml) was refluxed under nitrogen for 5 hours. The solvent was removed under reduced pressure to give a brown gum, which crystallized on standing. Recrystallization from methanol gave off-white crystals (2.36 g, 90%), m.p. 123°-125°.

1. customThe solvent was removed under reduced pressure
2. customto give a brown gum, which
3. customcrystallized
4. customRecrystallization from methanol