1: 5-bromo-2-methoxy-cyclohepta-2,4,6-trien-1-one With triphenylphosphine; palladium diacetate in tetrahydrofuran 0.25 h; Heating; 2: 4-(triethoxysilyl)-1,2,3-trimethoxybenzene With tetrabutyl ammonium fluoride in tetrahydrofuran Hiyama cross-coupling reaction; 0.5 h; Heating;

tetrabutyl ammonium fluoride; palladium diacetate; triphenylphosphine in tetrahydrofuran