4-Bromophenol → trans-2-(4-Bromophenoxy)cyclohexanol

Reaktionsgleichung

[Na].[Br:2][C:3]1[CH:8]=[CH:7][C:6]([OH:9])=[CH:5][CH:4]=1.[CH:10]12[O:16][CH:15]1[CH2:14][CH2:13][CH2:12][CH2:11]2>C(O)C>[Br:2][C:3]1[CH:8]=[CH:7][C:6]([O:9][C@@H:14]2[CH2:13][CH2:12][CH2:11][CH2:10][C@H:15]2[OH:16])=[CH:5][CH:4]=1

Komponenten

Versuchsvorschrift

Sodium metal (2.58 g, 112 mmol) was combined with absolute ethanol (200 mL) and allowed to react completely. 4-Bromophenol (19.4 g, 112 mmol) was added, and the reaction was stirred for 20 minutes, at which point 7-oxabicyclo[4.1.0]heptane (10.0 g, 102 mmol) was added, and the solution was heated at reflux for 15 hours. After removal of solvent in vacuo, the residue was partitioned between water (300 mL) and ethyl acetate (100 mL). The aqueous layer was extracted with ethyl acetate (2×100 mL), and the combined organic layers were washed with water (2×200 mL), dried over magnesium sulfate, filtered, and concentrated under reduced pressure. The resulting light tan solid was recrystallized from heptane (roughly 200 mL) to provide trans-2-(4-bromophenoxy)cyclohexanol as a fluffy white solid. Yield: 12.5 g, 46.1 mmol, 45%. 1H NMR (400 MHz, CDCl3) δ 1.26-1.46 (m, 4H), 1.75-1.79 (m, 2H), 2.08-2.14 (m, 2H), 2.52 (d, J=2.1 Hz, 1H), 3.72 (m, 1H), 3.96 (ddd, J=10.3, 8.6, 4.4 Hz, 1H), 6.84 (d, J=9.0 Hz, 2H), 7.37 (d, J=9.0 Hz, 2H).