1: 95 percent / imidazole / dimethylformamide / Ambient temperature 2: 81 percent / (Ph2)S<OC(CF3)2Ph>2 / CCl4 / 0.25 h 3: 88 percent / 9-fluorenone / various solvent(s) / 0.5 h / Irradiation 4: 92 percent / diisobutylaluminium hydride / toluene / 0.5 h / -78 °C 5: 91 percent / N-chlorosuccinimide, dimethyl sulfide / CH2Cl2 / 0.5 h / -20 °C 6: 2.) 5percent H2O2 / 1.) THF, -70 deg C, 2.) CH2Cl2, 1 h 7: 1.) n-BuLi / 1.) THF, n-hexane, -78 deg C, 5 min, 2.) THF, n-hexane, -78 deg C, 2 h View Scheme

1: 95 percent / imidazole / dimethylformamide / Ambient temperature 2: 81 percent / (Ph2)S<OC(CF3)2Ph>2 / CCl4 / 0.25 h 3: 88 percent / 9-fluorenone / various solvent(s) / 0.5 h / Irradiation 4: 92 percent / diisobutylaluminium hydride / toluene / 0.5 h / -78 °C 5: 91 percent / N-chlorosuccinimide, dimethyl sulfide / CH2Cl2 / 0.5 h / -20 °C 6: 2.) 5percent H2O2 / 1.) THF, -70 deg C, 2.) CH2Cl2, 1 h View Scheme

1: 95 percent / imidazole / dimethylformamide / Ambient temperature 2: 81 percent / (Ph2)S<OC(CF3)2Ph>2 / CCl4 / 0.25 h 3: 88 percent / 9-fluorenone / various solvent(s) / 0.5 h / Irradiation 4: 92 percent / diisobutylaluminium hydride / toluene / 0.5 h / -78 °C 5: 91 percent / N-chlorosuccinimide, dimethyl sulfide / CH2Cl2 / 0.5 h / -20 °C 6: 2.) 5percent H2O2 / 1.) THF, -70 deg C, 2.) CH2Cl2, 1 h 7: 1.) n-BuLi / 1.) THF, n-hexane, -78 deg C, 5 min, 2.) THF, n-hexane, -78 deg C, 2 h View Scheme