1.1: 100 percent / aq. HCl / tetrahydrofuran / 2 h / 20 °C 2.1: n-BuLi / dioxane; hexane / 1 h / 20 °C 2.2: 93 percent / dioxane; hexane / 4 h / 110 °C 3.1: 54 percent / ammonium cerium(IV) nitrate / acetonitrile; H2O / 11 h / -7 - 20 °C / pH 0.7 - 1.3 View Scheme

1.1: 100 percent / aq. HCl / tetrahydrofuran / 2 h / 20 °C 2.1: n-BuLi / dioxane; hexane / 1 h / 20 °C 2.2: 93 percent / dioxane; hexane / 4 h / 110 °C 3.1: 10 percent / ammonium cerium(IV) nitrate / acetonitrile; H2O / 11 h / -7 - 20 °C / pH 0.7 - 1.3 View Scheme