in pyridine T=0°C; 3 h;

1: 80 percent / Mg 2: m-chloroperoxybenzoic acid / CH2Cl2 3: pyridine View Scheme

1: m-chloroperoxybenzoic acid / CH2Cl2 2: pyridine View Scheme

1: 80 percent / Mg 2: m-chloroperoxybenzoic acid / CH2Cl2 3: pyridine View Scheme

1: 38 percent / phosphorus tribromide, pyridine / 1 h / Ambient temperature 2: 1.) magnesium, ether, 0 deg.C; 2.) ether, room temp., 0.5h 3: 57 percent / m-chloroperbenzoic acid / CH2Cl2 / 3 h / Ambient temperature 4: 96 percent / pyridine / 3 h / 0 °C View Scheme

1: 81 percent / lithium aluminium hydride / tetrahydrofuran / 1 h / 0 °C 2: 38 percent / phosphorus tribromide, pyridine / 1 h / Ambient temperature 3: 1.) magnesium, ether, 0 deg.C; 2.) ether, room temp., 0.5h 4: 57 percent / m-chloroperbenzoic acid / CH2Cl2 / 3 h / Ambient temperature 5: 96 percent / pyridine / 3 h / 0 °C View Scheme