1: 4-fluoro-α,α,α-trifluoromethoxybenzene With tert.-butyl lithium in tetrahydrofuran; pentane T=-70°C; 0.25 h; dry ice bath; 2: N,N-dimethyl-formamide in tetrahydrofuran; pentane T=-70 - 20°C; 0.5 h; 3: With water; ammonium chloride in tetrahydrofuran; pentane T=20°C;