Acetic Acid → 2-Fluoro-4-iodobenzoic acid
Reaktionsgleichung
[Cr](O[Cr]([O-])(=O)=O)([O-])(=O)=O.[Na+].[Na+].[F:12][C:13]1[CH:18]=[C:17]([I:19])[CH:16]=[CH:15]C=1C.OS(O)(=O)=O.[C:26]([OH:29])(=[O:28])[CH3:27]>>[F:12][C:13]1[CH:18]=[C:17]([I:19])[CH:16]=[CH:15][C:27]=1[C:26]([OH:29])=[O:28]Komponenten
5
Versuchsvorschrift
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)−;