Hydrochloric Acid → 4-Bromo-3-fluorothiophenol

4-Bromo-3-fluoro-benzenesulfonyl chloride (324 μl, 2.19 mmol) was added dropwise to a solution of triphenylphosphine (1.73 g, 6.58 mmol) in a mixture of dimethylformamide (125 μl) and dichloromethane (5 ml). The solution was stirred at room temperature for 16 hours, then 1 M aqueous hydrochloric acid (5 ml) was added and the layers were separated. The organic layer was concentrated in vacuo and the resultant residue taken up in 1 M aqueous sodium hydroxide (10 ml). The resulting suspension was filtered through Celite® and the filtrate washed with ether (10 ml×3), then neutralised by addition of 1 M aqueous hydrochloric acid (10 ml). The solution was extracted with ether (10 ml×3) and the combined organic extracts were dried (Na2SO4) then concentrated in vacuo to afford the title compound as a colourless oil (225 mg, 50%). 1H NMR (CDCl3, 300 MHz) 7.47 (1H, dd, J=8.4, 7.5 Hz), 7.06 (1H, dd, J=8.9, 2.2 Hz), 6.93 (1H, ddd, J=8.4, 2.1, 0.7 Hz), 3.54 (1H, br s).

1. customthe layers were separated
2. concentrationThe organic layer was concentrated in vacuo
3. filtrationThe resulting suspension was filtered through Celite®
4. washthe filtrate washed with ether (10 ml×3)
5. additionneutralised by addition of 1 M aqueous hydrochloric acid (10 ml)
6. extractionThe solution was extracted with ether (10 ml×3)
7. dry with materialthe combined organic extracts were dried (Na2SO4)
8. concentrationthen concentrated in vacuo

ORD record

ord-5241642950e942229201a2e6cc38372d

Source dataset

uspto-grants-2010_12

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07855216B2