[C:1]1([C:7](O)([CH3:9])[CH3:8])[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.[CH2:11]([O:13][C:14](=[O:22])[C:15]([O:17][Si](C)(C)C)=[CH2:16])[CH3:12].[Sn](Cl)(Cl)(Cl)Cl.C(=O)([O-])[O-].[K+].[K+]>C(Cl)Cl>[CH2:11]([O:13][C:14](=[O:22])[C:15](=[O:16])[CH2:17][C:7]([CH3:9])([C:1]1[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1)[CH3:8])[CH3:12]10.0 g of 2-phenyl-2-propanol and 30.4 g of 2-(trimethylsilyloxy)acrylic acid-ethyl ester (Bull. Chem. Soc. Jpn. 1992, 65, 3209) are introduced into 386 ml of CH2Cl2 and treated at −70° C. with 11.5 ml of tin tetrachloride. After 15 minutes at −70° C., the batch is introduced into semiconcentrated potassium carbonate solution, extracted with CH2Cl2, dried (Na2SO4) and concentrated by evaporation in a vacuum. Column chromatography on silica gel with ethyl acetate-cyclohexane yields 4.64 g of the product as a colorless oil.
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