Treatment of the trinuclear imido-bridged cluster compound [Ru 3 (µ 3 -NPh)(µ 3 -CO)(CO) 9 ] (1) with activated alkynes (methyl propynoate and methyl phenylpropynoate) and diynes (diphenylbutadiyne, 2,4-hexadiyne, 1,6-diphenyloxy-2,4-hexadiyne, and 1-trimethylsilyl-1,4-pentadiyne) in hexanes at reflux temperature leads to separable mixtures of the tetranuclear and binuclear derivatives [Ru 4 (µ 4 -NPh)(µ 4 ,η 2 -RCϵCRЈ)(µ-CO) 2 (CO) 9 ] and [Ru 2 {µ,η 3 -RC=CRЈC(O)-NPh}(CO) 6 ], respectively. While the former complexes feature a phenylimido ligand in a rather rare µ 4 -coordination mode, the binuclear compounds contain acrylamido ligands that result from the coupling of a CO ligand and the original phenylimido ligand of 1 with the incoming alkyne or diyne. Surprisingly, all the products derived from diynes contain a