1.1: 9-BBN / tetrahydrofuran / 4 h / 20 °C 1.2: 89 percent / aqueous sodium hydroxide; aqueous hydrogen peroxide / tetrahydrofuran / 2 h / 20 °C 2.1: 74 percent / triethylamine; sulfur trioxide-pyridine complex / CH2Cl2; dimethylsulfoxide / 3 h / 0 °C View Scheme

ozone; triphenylphosphine in dichloromethane T=20°C; 18 h;

1: With 9-borabicyclo[3.3.1]nonane dimer in tetrahydrofuran T=20°C; 4 h; 2: With sodium hydroxide; dihydrogen peroxide in tetrahydrofuran T=20°C; 2 h;