1: 1.) sodium hydride / 1) benzene, 25 deg C, 1.5 h; 2) benzene, reflux (2 h), 25 deg C (overnight) 2: 89.9 percent / hydrogen peroxide / methanol / 4 h / 25 °C 3: 74 percent / sodium carbonate / 160 - 180 °C / 10 Torr View Scheme

bromine in dichloromethane T=-70°C; 1.5 h;