1: 77 percent / benzene; methanol / Irradiation 2: 80 percent / 1N NaOH / methanol / Ambient temperature 3: 73 percent / pyridine / tetrahydrofuran / 3.5 h / Ambient temperature 4: 82 percent / TiCl4 / CH2Cl2 / 1 h / -78 °C View Scheme