Hydrogen Bromide → 2,2',4'-Trifluoro-3-hydroxybiphenyl-4-carbaldehyde
反応式
Br.[F:2][C:3]1[C:8]([O:9]C)=[C:7]([CH:11]=[O:12])[CH:6]=[CH:5][C:4]=1[C:13]1[CH:18]=[CH:17][C:16]([F:19])=[CH:15][C:14]=1[F:20]>C(O)(=O)C>[F:2][C:3]1[C:8]([OH:9])=[C:7]([CH:11]=[O:12])[CH:6]=[CH:5][C:4]=1[C:13]1[CH:18]=[CH:17][C:16]([F:19])=[CH:15][C:14]=1[F:20]参加物
4
実験手順
48% hydrobromic acid (22.0 mL) was added at room temperature to an acetic acid (120 mL) solution of 2,2′,4′-trifluoro-3-methoxybiphenyl-4-carbaldehyde (5.14 g), and the mixture was stirred at 120 C for 16 hours in a nitrogen atmosphere. Then, the solvent was distilled off under reduced pressure. The obtained residue was neutralized with a 1 M aqueous sodium hydroxide solution at room temperature, followed by extraction with ethyl acetate. The organic layer was separated, then washed with water and saturated saline in this order, and dried over anhydrous magnesium sulfate, and then, the solvent was distilled off under reduced pressure. The obtained residue was passed through a short silica gel column, and the solvent was distilled off under reduced pressure to obtain the title compound (4.60 g).