1: With tetrakis(triphenylphosphine) palladium(0); potassium carbonate in N,N-dimethyl-formamide T=85 - 95°C; Suzuki reaction; 24 h; 2: in N,N-dimethyl-formamide T=115°C; 5 h; Further stages.;

1.1: 35percent H2O2; AcOH / 80 °C 2.1: 90percent HNO3; 30percent SO3 / H2SO4 / 110 °C 3.1: AcBr / acetic acid / Heating 4.1: PBr3 / CHCl3 5.1: tetrakis(triphenylphosphine) Pd(0); aq. potassium carbonate / dimethylformamide / 24 h / 85 - 95 °C 5.2: 30.4 percent / dimethylformamide / 5 h / 115 °C View Scheme

1.1: 90percent HNO3; 30percent SO3 / H2SO4 / 110 °C 2.1: AcBr / acetic acid / Heating 3.1: PBr3 / CHCl3 4.1: tetrakis(triphenylphosphine) Pd(0); aq. potassium carbonate / dimethylformamide / 24 h / 85 - 95 °C 4.2: 30.4 percent / dimethylformamide / 5 h / 115 °C View Scheme

1.1: PBr3 / CHCl3 2.1: tetrakis(triphenylphosphine) Pd(0); aq. potassium carbonate / dimethylformamide / 24 h / 85 - 95 °C 2.2: 30.4 percent / dimethylformamide / 5 h / 115 °C View Scheme

1.1: AcBr / acetic acid / Heating 2.1: PBr3 / CHCl3 3.1: tetrakis(triphenylphosphine) Pd(0); aq. potassium carbonate / dimethylformamide / 24 h / 85 - 95 °C 3.2: 30.4 percent / dimethylformamide / 5 h / 115 °C View Scheme