Acetic Acid → 2-Fluoro-4-iodobenzoic acid

A solution of sodium dichromate (25.2 g, 84.0 mmol) in acetic acid (100 mL) was stirred for 10 min, followed by addition of 2-fluoro-4-iodo-1-methylbenzene (10.0 g, 42 mmol). The reaction mixture was stirred for 5 min followed by slow addition of conc. H2SO4 (60 mL) for 1-2 h. The reaction mixture stirred at 90-100° C. for 7-8 h. The reaction mixture was cooled and quenched with ice water. The reaction mass was extracted with ethyl acetate. The organic layer was dried over anhydrous sodium sulphate and concentrated to afford 5.0 g of the desired product. 1H NMR (300 MHz, DMSO d6): δ 7.58 (t, J=8.4 Hz, 1H), 7.67 (d, J=7.5 Hz, 1H), 7.75 (d, J=8.4 Hz, 1H), 13 (br s, 1H); MS (m/z): 264.99 (M−H)−;

1. stirringThe reaction mixture stirred at 90-100° C. for 7-8 h
2. temperatureThe reaction mixture was cooled
3. customquenched with ice water
4. extractionThe reaction mass was extracted with ethyl acetate
5. dry with materialThe organic layer was dried over anhydrous sodium sulphate
6. concentrationconcentrated

ORD-Eintrag

ord-e970629b02864d2590a079ed90e4db13

Quelldatensatz

uspto-grants-2016_09

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US09439890B2