1: 84.6 percent / TiCl4 / CH2Cl2 / 0.5 h / Ambient temperature 2: 83.4 percent / TiCl4 / CH2Cl2 / 48 h / Ambient temperature 3: 41.6 percent / TiCl4 / CH2Cl2 / 2 h / -20 °C 4: Et4NOTs, DDQ / nitromethane / Ambient temperature; electrolysis: <poly(tetrafluoroethylene)>fibre coated glassy carbon anode, Pt cathode, 2.2 F View Scheme

1: 84.6 percent / TiCl4 / CH2Cl2 / 0.5 h / Ambient temperature 2: 83.4 percent / TiCl4 / CH2Cl2 / 48 h / Ambient temperature 3: 41.6 percent / TiCl4 / CH2Cl2 / 2 h / -20 °C View Scheme