pyridine; chromium(VI) oxide in dichloromethane 4 h; Ambient temperature;

1: 67 percent / conc. H2SO4 / 16 h / Heating 2: 51 percent / NaBH4, CaCl2 / ethanol / 16 h / Ambient temperature 3: 59 percent / SeO2, H2O / dioxane / 3 h / 100 °C 4: 97 percent / 30percent H2O2 / H2O / 16 h / Ambient temperature 5: 1.) Et3N, CaCl2, 2.) H2SO4 / 1.) EtOH, 2.) reflux, 4 h 6: 59 percent / CrO3, pyridine / CH2Cl2 / 4 h / Ambient temperature View Scheme

1: 59 percent / SeO2, H2O / dioxane / 3 h / 100 °C 2: 97 percent / 30percent H2O2 / H2O / 16 h / Ambient temperature 3: 1.) Et3N, CaCl2, 2.) H2SO4 / 1.) EtOH, 2.) reflux, 4 h 4: 59 percent / CrO3, pyridine / CH2Cl2 / 4 h / Ambient temperature View Scheme

1: 51 percent / NaBH4, CaCl2 / ethanol / 16 h / Ambient temperature 2: 59 percent / SeO2, H2O / dioxane / 3 h / 100 °C 3: 97 percent / 30percent H2O2 / H2O / 16 h / Ambient temperature 4: 1.) Et3N, CaCl2, 2.) H2SO4 / 1.) EtOH, 2.) reflux, 4 h 5: 59 percent / CrO3, pyridine / CH2Cl2 / 4 h / Ambient temperature View Scheme

1: 1.) Et3N, CaCl2, 2.) H2SO4 / 1.) EtOH, 2.) reflux, 4 h 2: 59 percent / CrO3, pyridine / CH2Cl2 / 4 h / Ambient temperature View Scheme

1: 97 percent / 30percent H2O2 / H2O / 16 h / Ambient temperature 2: 1.) Et3N, CaCl2, 2.) H2SO4 / 1.) EtOH, 2.) reflux, 4 h 3: 59 percent / CrO3, pyridine / CH2Cl2 / 4 h / Ambient temperature View Scheme

1: 71 percent / conc. H2SO4 / 14 h / Heating 2: 19 percent / N-bromosuccinimide, dibenzoylperoxide / CCl4 / 3 h / 60 - 80 °C / Irradiation 3: 84 percent View Scheme

1: 19 percent / N-bromosuccinimide, dibenzoylperoxide / CCl4 / 3 h / 60 - 80 °C / Irradiation 2: 84 percent View Scheme

1: SeO2 2: 71 percent / conc. H2SO4 / 14 h / Heating 3: 19 percent / N-bromosuccinimide, dibenzoylperoxide / CCl4 / 3 h / 60 - 80 °C / Irradiation 4: 84 percent View Scheme

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