1: With sodium nitrite in water; acetic acid; acetonitrile T=0°C; 0.416667 h; 2: With sulfur dioxide; copper dichloride in water; acetic acid; acetonitrile T=10°C;

1: 3-Chloro-4-trifluoromethyl-phenylamine With hydrogenchloride; sodium nitrite in water; acetic acid T=0°C; 0.45 h; 2: sulfur dioxide With copper dichloride in water; acetic acid T=20°C;

n-butyllithium 1.) THF, hexane, -70 deg C, 45 min, 2.) THF, hexane, -70 deg C, 2 h; Yield given. Multistep reaction;