1.1: 83 percent / n-BuLi / tetrahydrofuran; hexane / 2 h / -50 - 20 °C 2.1: n-BuLi / tetrahydrofuran; hexane / 1 h / -50 °C 2.2: 100 percent / tetrahydrofuran; hexane / 1 h / -50 - 20 °C 3.1: 83 percent / aq. H2SO4 / benzene / 4 h / Heating View Scheme

1.1: 83 percent / n-BuLi / tetrahydrofuran; hexane / 2 h / -50 - 20 °C 2.1: n-BuLi / tetrahydrofuran; hexane / 1 h / -50 °C 2.2: 100 percent / H2O / tetrahydrofuran; hexane / -50 °C 3.1: 69 percent / aq. H2SO4 / benzene / 4 h / Heating View Scheme

1.1: 83 percent / n-BuLi / tetrahydrofuran; hexane / 2 h / -50 - 20 °C 2.1: n-BuLi / tetrahydrofuran; hexane / 1 h / -50 °C 2.2: 47 percent / tetrahydrofuran; hexane / 2 h / -50 °C 3.1: 27 percent Spectr. / aq. HCl / diethyl ether / 4 h / 20 °C View Scheme

1.1: 83 percent / n-BuLi / tetrahydrofuran; hexane / 2 h / -50 - 20 °C 2.1: n-BuLi / tetrahydrofuran; hexane / 1 h / -50 °C 2.2: 96 percent / tetrahydrofuran; hexane / 1 h / -50 - 20 °C 3.1: 62 percent / aq. H2SO4 / benzene / 4 h / Heating View Scheme