Carbon Chain Formation on Metallic Arrays. X-ray Structural Determinations of [Ru4(μ4-(CCC(CO2Me)C(CO2Me))(η-C5H4R)2(μ-CO)(CO)8], [{Ru(CO)2(η-C5H5)}2{μ-CCC(CO2Me)C(CO2Me)C(O)}], and [{Ru(CO)2(η-C5H5)2{μ-CC(CN)2CC(CN)2}] (R = H, Me)

Abstract

The open, planar Ru 4 C 2 compounds [Ru 4 (μ 4 -CC)(η-C 5 H 4 R) 2 (μ-CO) 2 (CO) 8 ] (R = H, Me) react with the activated electron-deficient alkyne dimethyl acetylenedicarboxylate, (CO 2 Me) 2 C 2 (DMAD), to afford a number of products. One of these was found to contain a metallacy-clopentadiene ligand ligated at the 1- and 2-positions by Ru(η-C 5 H 4 R) groups, and another was a new Ru 2 compound resulting from the coupling of DMAD, C 2 , and CO to produce a five-carbon chain.