1: 9-bromo-10-(2,2-dibromoethenyl)anthracene With lithium diisopropyl amide in tetrahydrofuran; n-heptane T=-40°C; 0.5 h; 2: chloro-trimethyl-silane in tetrahydrofuran; n-heptane T=-70 - 20°C; 12 h;

1.1: n-BuLi / tetrahydrofuran; hexane / 0.5 h / -90 °C 1.2: 68 percent / tetrahydrofuran; hexane / -90 - 20 °C 2.1: PPh3 / CH2Cl2 / 0.33 h / -20 °C 2.2: 95 percent / Et3N / CH2Cl2 / -70 - 20 °C 3.1: LDA / tetrahydrofuran; heptane / 0.5 h / -40 °C 3.2: 92 percent / tetrahydrofuran; heptane / 12 h / -70 - 20 °C View Scheme

1.1: PPh3 / CH2Cl2 / 0.33 h / -20 °C 1.2: 95 percent / Et3N / CH2Cl2 / -70 - 20 °C 2.1: LDA / tetrahydrofuran; heptane / 0.5 h / -40 °C 2.2: 92 percent / tetrahydrofuran; heptane / 12 h / -70 - 20 °C View Scheme