[C:1]([C:3]1[CH:4]=[C:5]([CH:12]=[CH:13][CH:14]=1)[CH:6]=[CH:7][C:8]([O:10][CH3:11])=[O:9])#[N:2].[Cl:15][C:16]([Cl:20])([Cl:19])[C:17]#[N:18].[Br-].[Al+3].[Br-].[Br-].[ClH:25]>ClCCl>[Cl:15][C:16]([Cl:20])([Cl:19])[C:17]1[N:18]=[C:17]([C:16]([Cl:19])([Cl:15])[Cl:25])[N:18]=[C:1]([C:3]2[CH:4]=[C:5]([CH:12]=[CH:13][CH:14]=2)[CH:6]=[CH:7][C:8]([O:10][CH3:11])=[O:9])[N:2]=1Methyl 3-cyanocinnamate (42 pw) is added to a mixture of trichloroacetonitrile (194.4 pw) and aluminum bromide (7.2 pw) in the absence of moisture and at about 25° C. Hydrogen chloride is then introduced over a period of 3 hours with stirring, while keeping the temperature constant. Stirring is discontinued, and the mixture is allowed to react further overnight. In this step, too, a constant temperature of 25° C. is maintained. The solidified mixture is dissolved in 800 pw of dichloromethane, washed with water, and the organic phase is dried over sodium sulfate. Evaporation of the solvent gives a white residue, which is recrystallized from methanol or benzene.
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