barium dihydroxide

1: 1.) oxalyl chloride, 2.) 70percent HClO4 / 1.) 45 deg C, 10 min, 2.) 0 deg C, 10 min 2: 80 percent / m-chloroperbenzoic acid, pyridine / CH2Cl2 / 0.67 h / 0 °C View Scheme