[Br:1][C:2]1C2C(=CC=CC=2)[C:5]([C:12]2(C=COC)[CH:17]=[CH:16][CH:15]=[CH:14][CH2:13]2)=[CH:4][CH:3]=1.CS(O)(=O)=O.C(=O)([O-])[O-].[K+].[K+]>ClCCl>[Br:1][C:2]1[C:13]2[CH:14]=[CH:15][CH:16]=[CH:17][C:12]=2[C:5]2[C:17]3[CH:16]=[CH:15][CH:14]=[CH:13][C:12]=3[CH:5]=[CH:4][C:4]=2[CH:3]=1180 g of the 1-bromo-4-[1-(2-methoxyvinyl) phenyl]naphthalene obtained and 1.0 L of dichloromethane were placed in a flask. During stirring at room temperature, 25 mL of methanesulfonic acid were added to the flask. Stirring was conducted at room temperature for 8 hours. After the completion of the reaction, 1 L of a 10% aqueous solution of potassium carbonate was added. An aqueous phase was removed and an organic phase which had been separated was washed with water and saturated brine, and then dried with magnesium sulfate. After the magnesium sulfate was filtered out, the organic phase was concentrated. The resulting residue was purified by means of silica gel column chromatography, whereby 24.4 g (yield: 15%) of 5-bromobenzo[c]phenanthrene was obtained.
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