1: 2,5-bis(2-phenyl-1-ethynyl)-1,4-benzenediol With n-butyllithium in tetrahydrofuran; hexane T=0 - 20°C; 2: With zinc(II) chloride in tetrahydrofuran; hexane; toluene T=120°C; 2.5 h; 3: iodobenzene With 1-methyl-pyrrolidin-2-one; tri-tert-butyl phosphine; tris(dibenzylideneacetone)dipalladium(0) chloroform complex in tetrahydrofuran; hexane; toluene T=100°C; 15 h; Further stages.;