[CH3:1][O:2][C:3]1[CH:13]=[CH:12][C:6]([CH:7]=[CH:8][C:9](O)=[O:10])=[CH:5][CH:4]=1.S(Cl)([Cl:16])=O>C1C=CC=CC=1>[CH3:1][O:2][C:3]1[CH:13]=[CH:12][C:6]([CH:7]=[CH:8][C:9]([Cl:16])=[O:10])=[CH:5][CH:4]=1100 ml of benzene was added to 17.8 grams of p-methoxycinnamic acid. 12 ml of thionyl chloride was added dropwise slowly thereto at ambient temperature. The temperature was elevated to 70° C. and the heating was continued until foaming ceased. Benzene and thionyl chloride were distilled off and the residue was dried thoroughly under reduced pressure.
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