n-butyllithium in tetrahydrofuran; hexane -78 deg C for 2.5 h, then warmed to -52 deg C during 2.5 h;

1: H2O2 / acetic acid 2: 1.) n-BuLi / 1.) ether, hexane, -78 deg C, 20 min., 2.) -78 deg C, 1 h, then 0 deg C, 2 h View Scheme

1: p-toluenesulfonic acid / toluene / Heating 2: H2O2 / acetic acid 3: 1.) n-BuLi / 1.) ether, hexane, -78 deg C, 20 min., 2.) -78 deg C, 1 h, then 0 deg C, 2 h View Scheme

n-butyllithium 1.) ether, hexane, -78 deg C, 20 min., 2.) -78 deg C, 1 h, then 0 deg C, 2 h; Yield given. Multistep reaction;