1: With AlCl3, aluminium chloride; boron trichloride in tetrahydrofuran Cooling with iceReflux; 2: With hydrogenchloride; water in tetrahydrofuran T=0 - 80°C; 1 h;

1: potassium acetate 2: bromine; chloroform 3: chromium (VI)-oxide; acetic acid 4: aq.-ethanolic hydrochloric acid 5: aqueous sulfuric acid / 150 °C View Scheme

1: bromine; chloroform 2: chromium (VI)-oxide; acetic acid 3: aq.-ethanolic hydrochloric acid 4: aqueous sulfuric acid / 150 °C View Scheme

1: chromium (VI)-oxide; acetic acid 2: aq.-ethanolic hydrochloric acid 3: aqueous sulfuric acid / 150 °C View Scheme

1: concentrated aqueous hydrochloric acid 2: potassium acetate 3: bromine; chloroform 4: chromium (VI)-oxide; acetic acid 5: aq.-ethanolic hydrochloric acid 6: aqueous sulfuric acid / 150 °C View Scheme

1: concentrated aqueous hydrochloric acid 2: potassium acetate 3: bromine; chloroform 4: chromium (VI)-oxide; acetic acid 5: aq.-ethanolic hydrochloric acid 6: aqueous sulfuric acid / 150 °C View Scheme

1: With silver hexafluoroantimonate; {RuCl2(1-methyl-4-(1-methylethyl)benzene)}2; copper (II) acetate monohydrate in 1,2-dichloro-ethane T=100°C; 24 h; Inert atmosphereSchlenk technique; 2: With sulfuric acid T=0 - 20°C; 2 h; Inert atmosphereSchlenk technique; 3: With sodium hydrogencarbonate Inert atmosphereSchlenk technique;

hydrogenchloride; sodium nitrite T=10°C; anschliessendes Erhitzen;

1: With hydrogenchloride; sodium nitrite in water T=0°C; 0.55 h; 2: With hydrogenchloride; tin(ll) chloride in water T=0 - 20°C; 1.16667 h; 3: With sodium hydroxide in water