sulfur dioxide; dinitrogen pentaoxide

1.1: sodium dithionite; ethanol / 6 h / Reflux; Inert atmosphere 2.1: Me2AlCl / hexane; dichloromethane / 150 h / 0 - 20 °C / Inert atmosphere 2.2: 20 h / Inert atmosphere 3.1: lithium aluminium tetrahydride / tetrahydrofuran / 1.5 h / -15 °C / Inert atmosphere View Scheme

hydrogen; palladium on activated charcoal in methanol T=20°C; P=3750.3 Torr; 5 h;

cesium fluoride in dimethyl sulfoxide T=120°C; 1.5 h;

sodium hydride in N,N-dimethyl-formamide T=100°C; 2 h;

caesium carbonate in dimethyl sulfoxide T=150°C;