1: 10 molpercent PhSH, 2 molpercent azobisizobutyronitrile 2: 10percent HCl / 1,2-dimethoxy-ethane / 6 h / 65 °C 3: triphenylphosphine, diethyl azodicarboxylate / benzene / 65 h / 25 °C 4: Raney nickel / ethanol / 80 °C 5: LiAlH4 / tetrahydrofuran View Scheme