sodium periodate; sulfuric acid; iodine in acetic anhydride; acetic acid T=25°C; 21 h;

1: With hydrogenchloride; sodium nitrite in water T=0°C; 0.5 h; 2: With potassium iodide in water T=20°C; 12 h; Further stages.;

1: 1-bromo-2-iodo-4-(trifluoromethyl)benzene With isopropylmagnesium chloride lithium chloride complex in tetrahydrofuran T=-20°C; 2 h; 2: formaldehyd in tetrahydrofuran T=-20°C; 1 h; Further stages.;

1,1'-bis-(diphenylphosphino)ferrocene; sodium t-butanolate; tris-(dibenzylideneacetone)dipalladium(0) in toluene T=140°C; 5 h;