Hydrogen Bromide → HCID 54373829, compound

Participants

Reaction Steps

To a stirred slurry of 2-(4-fluorophenyl)-1-(4-methylthiophenyl)ethanone from Step 1 (5.04 g, 19.36 mmol) in acetic acid (100 mL) was added HBr in acetic acid (45 mL, 48% by wt.) and bromine (1.0 mL, 3.09 g, 19.36 mmol). The resulting green slurry became homogeneous within 30 minutes. After 4 hours, the reaction was concentrated in vacuo, the residue diluted with toluene, and reconcentrated in vacuo. The crude haloketone was purified by flash chromatography (2:1 hexane:methylene chloride) and recrystallized from ethyl acetate and isooctane yielding 2-bromo-2-(4-fluorophenyl)-1-(4-methylthiophenyl)ethanone as an off-white solid (4.51 g, 69%): mp 108°-111° C. 1H NMR (CDCl3) 300 mHz δ7.94 (d, J=8.79 Hz, 2H), 7.60-7.50 (m, 2H), 7.25 (d, J=8.79 Hz, 2H), 7.10 (t, J=8.67 Hz, 2H), 6.34 (s, 1H), 2.56 (s, 3 H).

Provenance & Evidence