[Br:1][C:2]1[CH:9]=[CH:8][C:5]([CH:6]=O)=[CH:4][CH:3]=1.[Cl:10][C:11]1[CH:16]=[C:15]([Cl:17])[CH:14]=[CH:13][C:12]=1[CH2:18][C:19]([OH:21])=[O:20].C(OC(=O)C)(=O)C.C(N(CC)CC)C>C(OCC)(=O)C.O>[Br:1][C:2]1[CH:9]=[CH:8][C:5]([CH:6]=[C:18]([C:12]2[CH:13]=[CH:14][C:15]([Cl:17])=[CH:16][C:11]=2[Cl:10])[C:19]([OH:21])=[O:20])=[CH:4][CH:3]=1
Part A; To 4-bromobenzaldehyde (25 gram, 0.135 mol) is successively added 2,4-dichlorophenylacetic acid (27.7 gram, 0.135 mol), acetic anhydride (100 mL) and triethylamine (19 mL, 0.136 mol) and the resulting mixture is heated at reflux temperature for 90 minutes. The reaction mixture is cooled to 110° C. and water (100 mL) is slowly added. The resulting mixture is allowed to attain room temperature and ethyl acetate is added. The ethyl acetate layer is twice washed with water, dried over MgSO4, filtered and concentrated in vacuo. The resulting oil is crystallised from diisopropyl ether to give 3-(4-bromophenyl)-2-(2,4-dichlorophenyl)acrylic acid as a white solid (26.55 gram, 53% yield).
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