1: 89 percent / pyridinium chlorochromate, Celite / CH2Cl2 / 2 h / Ambient temperature 2: 78 percent / BF3*Et2O / CH2Cl2 / 1 h / Ambient temperature 3: 60 percent Spectr. / benzophenone / benzene / 0.42 h / Irradiation 4: 83 percent / CH3I / aq. ethanol / 48 h / Heating View Scheme

1: silica supported pyridinium chlorochromate / CH2Cl2 / 4 h / 20 °C 2: 87 mg / imidazole / CH2Cl2 / 19 h / 20 °C View Scheme

1: 63 percent / pyridine / CH2Cl2 / 17 h / 0 - 20 °C 2: 94 percent / 1,3-(4-Ph-OMe)2-5-Ph-1,3,4-triazinium perchlorate; K3PO4 / 1,2-dimethoxy-ethane / 16 h / 80 °C View Scheme

1: H2 / Pd-C / ethanol 2: CBr4, PPh3 / acetonitrile View Scheme

1: 61 percent / CBr4, triphenylphosphine / CH2Cl2 / 0.25 h 2: 75 percent / n-Bu3SnH, AIBN / benzene / 10 h / Heating View Scheme

Swern oxidation system Swern oxidation;

1: 60 percent / NaH / tetrahydrofuran / -78 °C 2: 68 percent / LiAlH4 / diethyl ether / 0 °C View Scheme

sodium hydride in tetrahydrofuran; mineral oil T=0 - 20°C; 4 h;