aluminium trichloride in dichloromethane 2 h; Ambient temperature;

1: 93 percent / AlCl3 / CH2Cl2 / 2 h / Ambient temperature 2: 83 percent / K2CO3 / dimethylformamide / 1 h / Heating 3: 40 percent Chromat. / SnCl4, HNO3 (d=1.52) / CH2Cl2 / 1 h / 20 - 30 °C View Scheme