1: 100 percent / aq. LiOH / tetrahydrofuran / 48 h / Ambient temperature 2: 100 percent / (COCl)2, pyridine / benzene / 0.5 h / Ambient temperature 3: 86 percent / SnCl4 / CH2Cl2 / 0.33 h / 0 °C 4: 67 percent / TsOH*H2O, benzyl alcohol / benzene / 10 h / Heating View Scheme

1: 100 percent / aq. LiOH / tetrahydrofuran / 48 h / Ambient temperature 2: 100 percent / (COCl)2, pyridine / benzene / 0.5 h / Ambient temperature 3: 86 percent / SnCl4 / CH2Cl2 / 0.33 h / 0 °C 4: m-chloroperbenzoic acid / CH2Cl2 / 15 h / Ambient temperature 5: benzene / 10 h / Heating View Scheme