1: 91 percent / p-TsOH*H2O / acetic acid / 4 h / 25 °C 2: 58 percent / t-BuOK; TiCl3; NH4OAc / methanol; H2O / 1 h / 25 °C / pH 5.3 3: 98 percent / Na2S2O4; NaHCO3 / H2O; benzene / 2 h / 100 °C 4: 93 percent / n-BuLi / tetrahydrofuran; hexane / 4 h / Heating 5: 72 percent / AgNO3; N-chlorosuccinimide / acetonitrile; H2O / 0.17 h / 10 °C View Scheme