Formic Acid → 4-(3-Fluorophenyl)cyclohexanone

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Reaction Steps

The compound (18) (61.9 g), formic acid (120 g) and toluene (120 ml) were put in a reaction vessel under a nitrogen atmosphere, heated under reflux for 3 hours, and cooled slowly to room temperature. Water (300 ml) and toluene (300 ml) were added and mixed thereto. The mixture was allowed to stand until it had separated into two phases, the organic and aqueous phases, and an extractive operation to an organic phase was carried out. The organic phase was fractionated, and washed sequentially with a saturated aqueous solution of sodium hydrogencarbonate and water, and then dried over anhydrous magnesium sulfate. Then the solvent of the solution was distilled off under reduced pressure, and the residue was purified with a fractional operation by means of column chromatography using a mixed solvent of toluene and ethyl acetate (toluene:ethyl acetate=9:1 by volume) as an eluent and silica gel as a stationary phase powder and dried, giving 47.2 g of 4-(3-fluorophenyl)cyclohexanone (19). The yield based on the compound (18) was 93.7%.

Provenance & Evidence