T=280°C;

1: 90 percent / Ac2O / 100 °C 2: 77 percent / xylene / Heating 3: 93 percent / 10percent aq. NaOH / 14 h / Heating 4: 96 percent / diphenyl ether / Heating 5: 95 percent / Br2 / CHCl3 / Ambient temperature 6: 1) n-BuLi / 1) ether, hexane, -35 to -30 deg C then RT, 15 h, 2) THF,ether, hexane, -30 to 25 deg C, overnight View Scheme

1: 93 percent / 10percent aq. NaOH / 14 h / Heating 2: 96 percent / diphenyl ether / Heating 3: 95 percent / Br2 / CHCl3 / Ambient temperature 4: 1) n-BuLi / 1) ether, hexane, -35 to -30 deg C then RT, 15 h, 2) THF,ether, hexane, -30 to 25 deg C, overnight View Scheme

1: 77 percent / xylene / Heating 2: 93 percent / 10percent aq. NaOH / 14 h / Heating 3: 96 percent / diphenyl ether / Heating 4: 95 percent / Br2 / CHCl3 / Ambient temperature 5: 1) n-BuLi / 1) ether, hexane, -35 to -30 deg C then RT, 15 h, 2) THF,ether, hexane, -30 to 25 deg C, overnight View Scheme

1: 95 percent / Br2 / CHCl3 / Ambient temperature 2: 1) n-BuLi / 1) ether, hexane, -35 to -30 deg C then RT, 15 h, 2) THF,ether, hexane, -30 to 25 deg C, overnight View Scheme

n-butyllithium 1) ether, hexane, -35 to -30 deg C then RT, 15 h, 2) THF,ether, hexane, -30 to 25 deg C, overnight; Yield given. Multistep reaction;