Guaiacol → 1-(2-Chloroethoxy)-2-methoxybenzene

Reaktionsgleichung

[CH3:1][O:2][C:3]1[CH:8]=[CH:7][CH:6]=[CH:5][C:4]=1[OH:9].Br[CH:11]([Cl:13])[CH3:12].C(=O)([O-])[O-].[K+].[K+]>CC(=O)CC>[Cl:13][CH2:11][CH2:12][O:9][C:4]1[CH:5]=[CH:6][CH:7]=[CH:8][C:3]=1[O:2][CH3:1]

Komponenten

Versuchsvorschrift

To a solution of 2-methoxyphenol (14.4 g, 116 mmol) in 2-butanone (200 mL) was added bromochloroethane (69.0 g, 480 mmol) followed by the addition of potassium carbonate (40.0 g, 280 mmol). The reaction mixture was mechanically stirred and heated to reflux for 24 h, then cooled to room temperature. The solids were filtered off and the solvent was removed under vacuum. The residue was dissolved in diethyl ether and washed with 10% of NaOH, dried over anhydrous magnesium sulfate, filtered and concentrated. Purification by silica gel column chromatography (25% EtOAc/hexane) afforded 7.55 g (35%) of a solid: mp 36-38°C. (Lit.2 41-43° C,); 1H NMR (DMSO, 400 MHz), 3.75 (s, 3H), 3.91 (dd, 2H), 4.20 (dd, 2H), 6.86-6.99 (m, 4H); MS (EI) m/z 186 (M+).