1: 73 percent / NaBH4, BF3*O(C2H5)2 / tetrahydrofuran 2: 98 percent / HBr / H2O; H2SO4 / Heating 3: 84 percent / Na2S*9H2O / H2O; methanol / Heating 4: 89 percent / 30 percent H2O2 / acetic acid; H2O / 1.5 h / Heating 5: 1) n-butyllithium / 1) benzene, ether, hexane, tetrahydrofuran, View Scheme

1: 89 percent / 30 percent H2O2 / acetic acid; H2O / 1.5 h / Heating 2: 1) n-butyllithium / 1) benzene, ether, hexane, tetrahydrofuran, View Scheme

1: 98 percent / HBr / H2O; H2SO4 / Heating 2: 84 percent / Na2S*9H2O / H2O; methanol / Heating 3: 89 percent / 30 percent H2O2 / acetic acid; H2O / 1.5 h / Heating 4: 1) n-butyllithium / 1) benzene, ether, hexane, tetrahydrofuran, View Scheme

1: 84 percent / Na2S*9H2O / H2O; methanol / Heating 2: 89 percent / 30 percent H2O2 / acetic acid; H2O / 1.5 h / Heating 3: 1) n-butyllithium / 1) benzene, ether, hexane, tetrahydrofuran, View Scheme

n-butyllithium 1) benzene, ether, hexane, tetrahydrofuran,; Yield given. Multistep reaction. Yields of byproduct given;