1: N,N-dimethyl-formamide With bis(trichloromethyl) carbonate in 1,2-dichloro-ethane T=0 - 20°C; 2: 5'-fluoro-2'-hydroxy-acetophenone in 1,2-dichloro-ethane T=0 - 20°C; 4.5 h; Further stages.;

1.1: sulfuric acid / 0.17 h / 20 °C 2.1: AlCl3, aluminium chloride / 6 h / 120 °C 2.2: |Cooling 3.1: trichlorophosphate / 0 - 20 °C View Scheme

1.1: AlCl3, aluminium chloride / 6 h / 120 °C 1.2: |Cooling 2.1: trichlorophosphate / 0 - 20 °C View Scheme