1: 3,5-dibromo-phenol With copper(l) iodide; [(t-Bu)3PH]BF4; bis-triphenylphosphine-palladium(II) chloride in 1,4-dioxane 0.5 h; 2: (Tri-iso-propylsilyl)acetylene With diisopropylamine in 1,4-dioxane T=20°C; Sonogashira reaction; 24 h;

tetrabutyl ammonium fluoride in tetrahydrofuran 10 h; cooling;