The reaction of 1,2-diethynyldisilanes with a catalytic amount of chlorotris (triphenylphosphine) rhodium(I) in toluene at room temperature afforded poly[(disilanylene)-butenyne-1,4-diyls]. Treatment of 1,2,5,6-tetrasilacyclo-octa-3,7-diyne with a catalytic amount of n-butyllithium THF at room temperature led to ring-opening polymerization to give poly[(disilanylene)ethynylenes]. When the films of poly[(disilanylene)butenyne-1,4-diyls] and poly[(disilanylene)ethynlyenes] were treated with antimony pentafluoride vapor, the highly conducting films were obtained.