1: 1.) BuLi / 1.) THF, hexane, -78 deg C, 2 h, 2.) THF, a) -78 deg C, 4 h, b) ambient temperature, 12 h 2: 89 percent / aq. HCl / tetrahydrofuran; H2O / 24 h / Ambient temperature View Scheme

1: 1.) BuLi / 1.) THF, hexane, -78 deg C, 2 h, 2.) THF, a) -78 deg C, 4 h, b) ambient temperature, 12 h 2: 86 percent / aq. HCl / tetrahydrofuran; H2O / 24 h / Ambient temperature View Scheme

perchloric acid; sulfuric acid 1) THF, water, RT, 24 h, 2) RT, 24 h; Yield given. Multistep reaction;

1: 1.) BuLi / 1.) THF, hexane, -78 deg C, 2 h, 2.) THF, a) -78 deg C, 4 h, b) ambient temperature, 12 h 2: 82 percent / aq. HCl / tetrahydrofuran; H2O / 24 h / Ambient temperature View Scheme