tert.-butyl lithium in tetrahydrofuran T=-30°C;

1: 63 percent / MCPBA / 0 °C 2: Acidic silica gel, 10percent oxalic acid / CH2Cl2 View Scheme

1: silica gel, 5percent aqueous solution of oxalic acid, sodium hydrogenocarbonate / CH2Cl2 2: LiAlH4 / 1.) THF, 10 min; 2.) acidic hydrolisis View Scheme