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- Typical Procedure : To a stirred solution of 1(lmmol) in 5mL of dry THF was added n-BuLi (l.lmmol. 1.6M in hexane) at -78°C under nitrogen atmosphere. After being stirred for 1h at -78°C. diethyl chlorophosphate (l.lmmol) was added and allowed to stand at room temperature for 3h. Then the mixture was cooled to-78°C. A solution of t-BuOK(1.2mmol) in 5mL THF was added to the reaction mixture followed by stirring for 10min. Normal work-up was performed. The desired vinylphosphonate was isolated by column chromatography on silica gel using 1:1 hexane/EtOAc as eluent.