Hydrochloric Acid → 4-(3-Fluorophenoxy)butanoic acid

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

A 1 L 3-neck round bottom flask equipped with a magnetic stirrer bar and a reflux condenser was charged with 17.17 g (150 mmol) of 3-fluorophenol, 33.82 g (165 mmol) of ethyl 4-bromobutyrate, 24.88 g, 180 mmol potassium carbonate and 600 mL of 2-butanone. The slurry heated to reflux. After stirring for 21 hr at reflux, the reaction mixture was cooled to 25° C., filtered and concentrated. The residue was taken up in of water and treated with 150 mL of 2N aqueous sodium hydroxide (300 mmol). The reaction mixture was heated to reflux for 30 min and cooled to 25° C. The brown solution was acidified with aqueous 150 ml of 2N hydrochloric acid. The resulting pink solid was isolated by filtration washing with hexanes to yield 25.04 g, mp 53-54° C. Combustion analysis: Found: C, 60.53; H, 5.79%; F, 9.84%; C10H11FO3 requires C, 60.60; H, 5.59%; F, 9.59%; 1H NMR (d6-DMSO): δ 12.1, bs, 1H (COOH); δ 7.20, dd, 1H, (H para to OR); δ 6.7, m, 3H (aryl H's); δ 3.90, t 2H, (CH2 α to O); δ 2.30, t, 2H (CH2 α to COOR); δ 1.87, p, 2H (CH2 β to ArO and COOH).

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