Ethanone, 1-(2,5-dichlorophenyl)- → 2-Bromo-1-(2,5-dichlorophenyl)ethanone

To 2,5-dichloroacetophenone (5.0 g, 26.45 mmol) in anhydrous tetrahydrofuran (53 mL) under argon was added phenyltrimethylammonium tribromide (9.94 g, 26.45 mmol, 1.0 eq) at 0° C. The reaction mixture was stirred at ambient temperature for 16 h, concentrated, and re-dissolved in ethyl acetate. The organic layer was washed with water (2×250 mL) and brine (1×150 mL), dried (MgSO4), filtered, and evaporated in vacuo. Purification using MPLC chromatography (Biotage) gave 3.47 g (52.5%) of 2-bromo-1-(2,5-dichlorophenyl)ethanone as a clear oil. 1H-NMR (DMSO-d6) δ 7.93 (dd, J=2.1 Hz, 0.9 Hz, 1H), 7.61 to 7.60 (m, 2H), 4.86 (s, 2H);

1. concentrationconcentrated
2. dissolutionre-dissolved in ethyl acetate
3. washThe organic layer was washed with water (2×250 mL) and brine (1×150 mL)
4. dry with materialdried (MgSO4)
5. filtrationfiltered
6. customevaporated in vacuo
7. customPurification

ORD-Eintrag

ord-940cd5ca08984feb967880a2d7688f0b

Quelldatensatz

uspto-grants-2008_06

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US07384947B2