[CH:1]([C:3]1[CH:8]=[CH:7][C:6]([CH:9]([CH3:15])[C:10]([O:12][CH2:13][CH3:14])=[O:11])=[CH:5][CH:4]=1)=O.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.CCCCCC.C(OCC)(=O)C.[C:47](Cl)(Cl)([Cl:49])[Cl:48]>>[Cl:48][C:47]([Cl:49])=[CH:1][C:3]1[CH:8]=[CH:7][C:6]([CH:9]([CH3:15])[C:10]([O:12][CH2:13][CH3:14])=[O:11])=[CH:5][CH:4]=1In 260 ml of carbon tetrachloride were dissolved 60 g of ethyl 2-(4-formylphenyl)propionate and 122 g of triphenylphosphine, followed by stirring in a stream of nitrogen gas at 50° C. for 4.5 hours. After cooling, the mixture was poured into 1 l of cold n-hexane and filtered. The filtrate was concentrated under reduced pressure to give an oily substance, which was subjected to silica gel column chromatography (eluent: n-hexane--ethyl acetate=40:1) to obtain 29 g of ethyl 2-[4-(2,2-dichlorovinyl)phenyl]propionate (ST-5) as an oily substance, b.p.0.2-0.3 128°-129° C.
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