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;