1: 48 percent / tetra-n-propylammmonium perruthenate, crushed 3 Angstroem molecular sieves, N-methylmorpholine N-oxide / CH2Cl2 / 3 h / Ambient temperature 2: 40 percent / O2, Rose Bengal, (i-Pr)2NEt / CH2Cl2 / 2 h / -80 °C / Irradiation 3: 60 percent / benzene / 3 h / 0 °C / Irradiation View Scheme