1: 71 percent / diphenyl ether / 1.15 h / Heating 2: 75 percent / 1.) LiHMDS, HMPA; 2.) AcOH / tetrahydrofuran / -78 °C 3: 71 percent / H2 / Pd-CaCO3 4: 65 percent / Et3SiH, CF3CO2H / benzene; CH2Cl2 5: 80 percent / BBr3 / CH2Cl2 / 0 °C View Scheme

1: 71 percent / diphenyl ether / 1.15 h / Heating 2: 75 percent / 1.) LiHMDS, HMPA; 2.) AcOH / tetrahydrofuran / -78 °C 3: 71 percent / H2 / Pd-CaCO3 4: 65 percent / Et3SiH, CF3CO2H / benzene; CH2Cl2 View Scheme

1: 71 percent / diphenyl ether / 1.15 h / Heating 2: 75 percent / 1.) LiHMDS, HMPA; 2.) AcOH / tetrahydrofuran / -78 °C View Scheme