1: 95 percent / H2 / Pd/C / ethanol 2: 84 percent / (COCl)2 / CH2Cl2; dimethylsulfoxide / 1 h / -78 °C 3: 66 percent / NaNH2 / tetrahydrofuran / 2 h / -78 °C 4: 94 percent / 48percent HBr / ethanol / 1 h 5: 94 percent / Ag2CO3 / benzene / 2 h View Scheme