selenium(IV) oxide in acetic acid T=60°C; 4 h;

salcomine; oxygen in acetonitrile 2 h; Ambient temperature; Yield given. Yields of byproduct given;

Fremy’s salt

titanium(IV) isopropylate; tert.-butylhydroperoxide 1.) dichloromethane, -23 deg C, 0.5 h; 2.) -23 deg C, 1 h; Yield given. Multistep reaction. Yields of byproduct given;