1: 1.) BuLi; 2.) ammonium chloride solution / tetrahydrofuran / 0 - 50 °C / 1.) THF, 0-50 deg C, 2 h; 2.) THF, 0 deg C 2: 49 percent / ethylmagnesium bromide / benzene; diisopropyl ether / 120 h / Heating 3: 48 percent / tetra-n-propylammmonium perruthenate, crushed 3 Angstroem molecular sieves, N-methylmorpholine N-oxide / CH2Cl2 / 3 h / Ambient temperature 4: 40 percent / O2, Rose Bengal, (i-Pr)2NEt / CH2Cl2 / 2 h / -80 °C / Irradiation 5: 60 percent / benzene / 3 h / 0 °C / Irradiation View Scheme