[C:1]([C:3](=[CH:7][C:8]1[CH:13]=[CH:12][CH:11]=[CH:10][CH:9]=1)[C:4](O)=[O:5])#[N:2].S(Cl)([Cl:16])=O>C1C=CC=CC=1>[C:1]([C:3](=[CH:7][C:8]1[CH:13]=[CH:12][CH:11]=[CH:10][CH:9]=1)[C:4]([Cl:16])=[O:5])#[N:2]100 ml of benzene was added to 17.3 grams of α-cyanocinnamic 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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