Hexacarbonyltungsten(0)-catalyzed reactions of silacyclopropenes are reported. Treatment of 1-mesityl-1-methyl-3-phenyl-2-(trimethylsilyl)-1-silacyclopropene and 1-methyl-3-phenyl-1,2-bis(trimethylsilyl)-1-silacyclopropene with a catalytic amount of W(CO)6 afforded phenyl(trimethylsilyl)acetylene and the respective silylenes which could be readily trapped by 2,3-dimethyl-1,3-butadiene. Mesitylmethylsilylene could