aluminium trichloride in dichloromethane T=-30°C; 1 h;

1: 87 percent / tetrahydrofuran / 2 h / Ambient temperature 2: 88 percent / KOH / methanol; H2O / 24 h / Ambient temperature 3: 93 percent / SOCl2 / 0.83 h / 120 °C 4: 57 percent / AlCl3 / CH2Cl2 / 1 h / -30 °C View Scheme

1: 93 percent / SOCl2 / 0.83 h / 120 °C 2: 57 percent / AlCl3 / CH2Cl2 / 1 h / -30 °C View Scheme

1: 88 percent / KOH / methanol; H2O / 24 h / Ambient temperature 2: 93 percent / SOCl2 / 0.83 h / 120 °C 3: 57 percent / AlCl3 / CH2Cl2 / 1 h / -30 °C View Scheme