1.1: n-BuLi / tetrahydrofuran; hexane / -78.15 - -40.15 °C 1.2: 91 percent / I2 / tetrahydrofuran; hexane / -78.15 - 19.85 °C 2.1: 81 percent / potassium carbonate / methanol; CH2Cl2 / 20 °C View Scheme