Purity( Potassium iodate Method)  min. 97.0 %  

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Typical Procedure:A solution of 1,3-dicarbonyl compound (76 mg, 0.40 mmol) and NaH (11 mg, 0.48 mmol) in THF (2 mL) is stirred at rt for 1 h under an atmosphere of nitrogen. Ethynyl(phenyl)iodonium tetrafluoroborate1) (150 mg, 0.48 mmol) is then added and the resulting mixture is stirred at rt for 3 h. The reaction mixture is diluted with H2O (5 mL) and extracted with Et2O (3 x 10 mL). The combined organic layers are dried over MgSO4 and the solvent is removed under reduced pressure. The crude product is purified by silica gel flash chromatography (Hexane : EtOAc = 20 : 1) to afford the ethynylated compound (59 mg, 69%) as yellow solid.