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With sulfuric acid; nitric acid; at 0℃; for 1.16667h;
A. 1 -Fluoro-2-nitro-4-trifluoromethoxy-benzene and 4-Fluoro-2-nitro-1 - trifluoromethoxy-benzeneTo a mixture of <strong>[352-67-0]1-fluoro-4-trifluoromethoxy-benzene</strong> (31.57 g, 0.18 mol) in cone. H2SO4 (100 ml_) at 0C is added cone. HNO3 (30 ml_) dropwise over a 10 min period. After the mixture is stirred at 0 C for 1 h, it was poured into ice. The mixture is extracted with EtOAc. The organic extract is washed with H2O (3x) and brine, dried over MgSO4, filtered, and concentrated in vacuo to yield 38 g (96%) of the product as a mixture of 1 -fluoro-2-nitro-4-trifluoromethoxy-benzene and 4-fluoro-2-nitro-1 - trifluoromethoxy-benzene (-30/70, based upon 19F NMR). 1H NMR (CDCI3): delta 8.00- 7.90 and 7.80-7.65 (m, 1 H), 7.60-7.25 (m, 2H); 19 F NMR (CDCI3) delta -57.59 and -58.11 (s, 3F), -109.07 and -117.90 (t, J = 6.2 and d, J = 6.2, 1 F).
At -10 C, 90% fuming nitric acid (25mL) was added to concentrate sulfuric acid (50 mL) slowly to keep the temperature below 0 C. At -20 C, <strong>[352-67-0]1-fluoro-4-trifluoromethoxy-benzene</strong> (5 g, 27.7 mmol) was added portionwise to keep the temperature of the reaction mixture below 0 C. After addition, the reaction mixture was kept at 0 C for 30 min, poured into ice-water, extracted with EtOAc. The extracts were concentrated to give a mixture (6.05 g) of 4-fluoro-2-nitro-1-trifluoromethoxy-benzene and 1-fluoro-2-nitro-4-trifluoromethoxy-benzene in a 3:1 ratio.
With hydrogenchloride; hydrogen;palladium 10% on activated carbon; In ethanol; under 2585.81 Torr; for 3.5h;
The crude nitration product (6.05 g) was dissolved in ethanol (40 mL) and shacked with 10% Pd/C (310 mg) and concentrate HCl (2.8 mL) under H2 (50 psi) for 3.5 h. Filtration and concentration gave a mixture (8.0g) of 5-fluoro-2-trifluoromethoxy-phenylamine and its isomer 2-fluoro-5-trifluoromethoxy-phenylamine in 3:1 ratio.
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