1.1: dihydrogen peroxide; sulfuric acid / tetrahydrofuran; water / 24 h / 0 - 60 °C 2.1: copper diacetate; 1,10-phenanthroline; triethylamine; oxygen / toluene; acetonitrile / 20 °C 2.2: 1 h / 0 - 20 °C View Scheme