Hydrochloric Acid → (Z)-3-hydroxy-4-fluoro-4-hepten-1-yne

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Reaction Steps

After 13.0 g of (Z)-2-fluoro-2-pentenal was dissolved in 30 ml of dry tetrahydrofurane, a tetrahydrofurane solution of acetylene magnesium bromide (the molar amount of acetylene magnesium bromide was 1.5 times that of the said aldehyde) was added to the solution dropwise while it was cooled with ice and maintained at a temperature of 10° C. or below. The mixture was stirred for 30 minutes while being cooled with ice and then stirred at 20° C. for one hour. The reaction solution was poured into ice-cooled 5% dilute hydrochloric acid and extracted with ethyl acetate. The ethyl acetate layer was washed with saturated aqueous sodium chloride solution and dried over anhydrous magnesium sulfate. After the solvent was distilled off, the residue was distilled under reduced pressure, thereby obtaining 9.5 g of the desired substance as a pale yellow oil.

Provenance & Evidence