1.1: 82 percent / bromine; potassium acetate / 16 h / 20 °C 2.1: n-BuLi / tetrahydrofuran; hexane / 0.25 h / -78 °C 2.2: 70 percent / hexane; tetrahydrofuran / 2 h / -78 - 20 °C 3.1: 91 percent / anisole; trifluoroacetic acid / 24 h / Heating View Scheme