4 A molecular sieve; sodium acetate; pyridinium chlorochromate in dichloromethane T=20°C; Oxidation; 0.75 h;

1.1: 64 percent / Hg(OAc)2 / 24 h / 170 °C 2.1: Mg; iodine 2.2: 81 percent / tetrahydrofuran / 8 h 3.1: 82 percent / pyridinium chlorochromate; NaOAc; molecular sieves 4 Angstroem / CH2Cl2 / 0.75 h / 20 °C View Scheme

1.1: Mg; iodine 1.2: 81 percent / tetrahydrofuran / 8 h 2.1: 82 percent / pyridinium chlorochromate; NaOAc; molecular sieves 4 Angstroem / CH2Cl2 / 0.75 h / 20 °C View Scheme

molecular sieve; pyridinium chlorochromate 1.) THF, 8 h; 2.) CH2Cl2, 40 min; Yield given. Multistep reaction;