Yield given. Multistep reaction;

N-bromosuccinmide in tetrachloromethane T=100°C; 2 h;

N-bromosuccinmide in tetrachloromethane 3.5 h; Heating;

1: Mg / tetrahydrofuran 2: 98 percent / tetrahydrofuran / 2 h 3: 16.7 g / H2O2 / H2O; CHCl3 / 1 h 4: 71 percent / Br2 / CHCl3 / 1.5 h / Ambient temperature; other solvent 5: 100 percent / HSiCl3, pyridine / benzene / Heating 6: 61 percent / NaOMe / methanol; benzene / 96 h / Heating View Scheme