Diethyl Ether → 2,2,2-Trifluoro-1-(2-methoxyphenyl)ethanone
Reaktionsgleichung
CO[Mg][C:4]1[CH:9]=[CH:8][CH:7]=[CH:6][CH:5]=1.[Br-].[F:11][C:12]([F:18])([F:17])[C:13](OC)=[O:14].[CH2:19]([O:21]CC)C>>[F:11][C:12]([F:18])([F:17])[C:13]([C:4]1[CH:5]=[CH:6][CH:7]=[CH:8][C:9]=1[O:21][CH3:19])=[O:14]Komponenten
4
Versuchsvorschrift
2 Methoxy phenyl magnesium bromide (35 ml) was added slowly to a solution of methyl trifluoroacetate (5.0 g) in diethyl ether (100 ml) at −78° C. The reaction mixture was warmed to room temperature over 12 hrs and the quenched with saturated ammonium chloride solution (100 ml). The mixture was then partitioned between ethyl acetate (500 ml) and water (250 ml) The organics were separated and dried over magnesium sulfate filtered and concentrated in vacuo. The crude residue was purified by column chromatography on silica gel eluting with 100% hexanes, 90:10 and 80:20, hexanes:ethyl acetate, to afford title compound as a yellow oil. (4.0 g). 1H NMR (CDCl3): δ 3.57 (s, 3H), 7.00 (m, 2H), 7.35 (m, 1H), 7.63, (d, J=2.54 Hz 2H).