1: With triethylamine; magnesium chloride in acetonitrile Hofslokken-Skattebol's procedure; 4 h; Heating; 2: With hydrogenchloride in acetonitrile T=20°C;

1.1: FeCl3 / toluene / 6 h / Heating 1.2: 31 percent / aq. HCl / toluene / 20 °C 2.1: triethylamine; MgCl2 / acetonitrile / 4 h / Heating 2.2: 83 percent / aq. HCl / acetonitrile / 20 °C View Scheme

1.1: FeCl3 / toluene / 6 h / Heating 1.2: 31 percent / aq. HCl / toluene / 20 °C 2.1: triethylamine; MgCl2 / acetonitrile / 4 h / Heating 2.2: 83 percent / aq. HCl / acetonitrile / 20 °C View Scheme