1: 13 percent / acetonitrile / 4.5 h / Irradiation; λ=254 2: 66 percent / H2 / 10percent Pd/CaCO3 / methanol / 1 h 3: conc. H2SO4 / 7 h / Heating 4: 1.) methyllithium, 2.) phenylselenenyl bromide, 3.) pyridine, 30percent H2O2 / 1.) ether, THF, 0 deg C, 10 min, 2.) ether, THF, -78 deg C, 10 min, 3. CH2Cl2, H2O, 0 deg C View Scheme

in acetonitrile 4.5 h; Irradiationλ=254; Further byproducts given;

in acetonitrile 4.5 h; Irradiationvarious solvents and wave-lenght; Product distribution;