1-(4-bromo-2,5-dipropoxyphenylethynyl)-4-[2,5-dipropoxy-4-(2,5-dipropoxyphenylethynyl)phenylethynyl]-2,5-dipropoxybenzene 、
1-[2,5-dipropoxy-4-(2,5-dipropoxyphenylethynyl)phenylethynyl]-4-(2,5-dipropoxy-4-ethynylphenyl)-2,5-dipropoxybenzene 在
copper(l) iodide 哌啶 、 bis-triphenylphosphine-palladium(II) chloride 、
三苯基膦 作用下,
以5%的产率得到heptamer(2,5-dipropoxy-1,4-phenylene)