1: 46 percent / CaCO3 / toluene / 3 h / Heating 2: 46 percent / NBS, (PhCO)2O2 / CCl4 / 1.5 h / Heating 3: 43 percent / DBU / tetrahydrofuran / 1 h / 0 °C 4: 70 percent / 2-acetylnaphthalene / methanol / Irradiation; 1.) 0 deg C, 2 h, 2.) r.t., 12 h 5: 61 percent / 2-acetylnaphthalene / diethyl ether / 5 h / Ambient temperature; Irradiation View Scheme