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 metallacyclopentadiene 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.a C(100) is the centroid of the Cp rings; primed atoms are related by the intramolecular 2-axis.

Coordinating Tectons: Bipyridyl-Terminated Group 8 Alkynyl Complexes

“…We have found that the CpRu(CO) 2 moiety is extremely flexible in its mode of coordination and has allowed us to investigate a number of unusual − bonding situations. Thus, we first decided to attempt the formation of mono-alkynyl complexes to provide suitable models for the formation of oligomeric complexes.…”

Supramolecular interactions between hexabromoethane and cyclopentadienyl ruthenium bromides: Halogen bonding or electrostatic organisation?

“…[10][11][12] We have for some considerable time explored the chemistry associated with the CpRu(CO) 2 moiety because of the conformational flexibility it exhibits, which has allowed the isolation of many interesting complexes. [13][14][15][16][17][18][19][20][21][22] In the course of preparing [CpRu(CO) 2 Br] using a minor modification of the published procedure 23 (using bromoform rather than CBr 4 ) we discovered that the reaction did not proceed according to our expectations, Scheme 1, giving not only the expected bromide complex but also gave appreciable contamination with hexabromoethane.…”

C−C Coupling of a Permetalated Ethene, (μ4-CC)Ru2(FeCp*)2(CO)10, with Alkynes, and Isolation of a Labile MeCN Adduct, (μ4-CC)Ru2(FeCp*)2(CO)8(NCMe)2

“…Electron counting indicates that the Ru11−Ru12 interaction is a dative bond from Ru12 to Ru11 (2.795(1) Å). Koutsantonis et al reported formation of a related compound, 12 , from (μ 4 -CC)Ru 4 Cp 2 (CO) 10 ( 11 ) (the RuCp analogue of 2 ) and dimethyl acetylenedicarboxylate (Scheme ) . In comparison to the case for 11 , complex 12 contains one more CO ligand, which causes cleavage of one of the two CpRu−Ru bonds.…”