1: LiAlH4 / diethyl ether / 30 h / 0 °C 2: potassium hydride / toluene / 3 h / Heating 3: DMAP, Et3N / CH2Cl2 / 16 h / Ambient temperature 4: 1.) aq. HCl, 2.) Ag2CO3 / 1.) THF, 45 deg C, 2.) benzene, reflux, 4 h 5: 31 percent / BBr3 / CH2Cl2 / 6 h / -23 °C View Scheme