Water → 5724-03-8

1,550 ml (2.0 mol) of a 1.29 M solution of vinylmagnesium chloride in tetrahydrofuran were introduced into a 4 l stirred flask under nitrogen. Subsequently, while stirring under nitrogen at 30°-35° C., a solution of 222.0 g (1,764 mol) of 4-fluorobenzaldehyde in 2,000 ml of tetrahydrofuran was added over the course of 30 min, cooling the reaction mixture with ice. The mixture was then stirred at room temperature under nitrogen for 2.5 h. Subsequently, while stirring and cooling with ice, 180 ml of water were added, the mixture was filtered with suction, and the residue from the filter was washed 3x with 150 ml of tetrahydrofuran. The filtrates were combined, dried with sodium sulfate and concentrated. 265.7 g (99%) of product were obtained in the form of a yellow-brown oil.