1: 184 mg / p-TsOH / CH2Cl2 / 0.75 h / 0 °C 2: sodium methylsulfinylmethide / dimethylsulfoxide / 30 h / Ambient temperature 3: 97 mg / diethyl ether 4: 514 mg / aq. acetic acid / 24 h / 30 - 40 °C 5: 188 mg / pyridine / 3 °C 6: 216 mg / 5percent KOH / methanol; H2O / 2 h / Ambient temperature View Scheme