bromine in dichloromethane T=20 - 35°C; 15 h;

1: With trichlorophosphate T=95°C; Vilsmeier-Haack reaction; 1 h; 2: With water; sodium hydroxide 0.5 h;

1: tris(4-bromophenyl)amine With n-butyllithium in tetrahydrofuran; hexane T=-78°C; 1 h; 2: N,N-dimethyl-formamide in tetrahydrofuran; hexane T=-78 - 20°C; 2 h; Further stages.;

1: trichlorophosphate / 5 h / 0 - 100 °C / |Inert atmosphere 2: N-bromosuccinmide / tetrahydrofuran / 5 h / |Inert atmosphere; |Reflux View Scheme