反应详情

To a solution of vanillin (30.40 g, 0.20 mol) in glacial acetic acid (200 ml) was added bromine (46.79 g, 0.29 mol) in glacial acetic acid (20 ml) at 100 over a period of 1 h. Additional acetic acid (100 ml) was added to the thickening mixture and the reaction was stirred for 24 h at ambient temperature. The reaction was diluted with ice-water (300 ml) and then the precipitate was filtered and washed with water and dried in vacuo to give the desired compound (40.69 g, 89%).

1. filtrationthe precipitate was filtered
2. washwashed with water
3. customdried in vacuo