反应详情

A mixture of 2,3-dihydro-2-phenyl-4H-1-benzopyran-4-one (50.0 g), methanol (535 ml), water (50 ml), potassium carbonate (59.3 g), and hydroxylamine HCl (59.8 g) was heated at reflux for 16 hours, then poured into ice-water; the oxime of 2,3-dihydro-2-phenyl-4H-1-benzopyran-4-one was filtered off, washed with water, then dried in air. Yield: 52 g.

1. temperaturewas heated
2. temperatureat reflux for 16 hours
3. filtrationthe oxime of 2,3-dihydro-2-phenyl-4H-1-benzopyran-4-one was filtered off
4. washwashed with water
5. customdried in air