pyridine; dihydrogen peroxide T=20°C; 144 h;

1.1: n-butyllithium / tetrahydrofuran; hexane / -78 °C 1.2: selenium / tetrahydrofuran; hexane / -78 °C 1.3: 72 percent / tetrahydrofuran; hexane / -78 °C 2.1: 90 percent / aq. hydrogen peroxide; pyridine / 2 h / 20 °C 3.1: 85 percent / aq. hydrogen peroxide; pyridine / 144 h / 20 °C View Scheme

1: 90 percent / aq. hydrogen peroxide; pyridine / 2 h / 20 °C 2: 85 percent / aq. hydrogen peroxide; pyridine / 144 h / 20 °C View Scheme

1: 83 percent / n-BuLi, S8 2: 84 percent / Se, n-Bu-Li 3: 87 percent / H2O2 / pyridine 4: H2O2 / pyridine View Scheme

dihydrogen peroxide