[Br:1][C:2]1[CH:7]=[CH:6][C:5]([C:8]2[CH:13]=[CH:12][C:11]([CH:14]=[CH:15][O:16]C)=[CH:10][N:9]=2)=[CH:4][CH:3]=1>O1CCCC1>[Br:1][C:2]1[CH:3]=[CH:4][C:5]([C:8]2[CH:13]=[CH:12][C:11]([CH2:14][CH:15]=[O:16])=[CH:10][N:9]=2)=[CH:6][CH:7]=1A solution of 12.4 g of 2-(p-bromophenyl)-5-(2-methoxyvinyl)pyridine in 200 ml of tetrahydrofuran/2N hydrochloric acid (vol. 4:1) is heated to reflux for 1 hour while stirring. The reaction mixture is subsequently partitioned three times in diethyl ether/water. The organic extracts are washed twice with water, dried over magnesium sulphate, filtered and evaporated, whereby [2-(p-bromophenyl)-5-pyridyl]acetaldehyde is obtained as the residue.
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