copper(l) iodide in tetrahydrofuran T=0 - 25°C;

1: 78 percent / 3-chloroperbenzoic acid / CH2Cl2 / 0 - 25 °C 2: 86 percent / CuI / tetrahydrofuran / 0 - 25 °C View Scheme

1.1: KH / tetrahydrofuran / 1 h / 25 °C 1.2: 92 percent / tetrahydrofuran; dimethylsulfoxide / 1 h / 0 °C 2.1: 78 percent / 3-chloroperbenzoic acid / CH2Cl2 / 0 - 25 °C 3.1: 86 percent / CuI / tetrahydrofuran / 0 - 25 °C View Scheme

pyridinium chlorochromate in dichloromethane T=25°C; 0.5 h;