W(η2-PhCCPh)3(η1-Ph2PCCPPh2) as a ligand to prepare homo- and hetero-nuclear cluster complexes
摘要:
Reaction of W(eta(2) -PhCequivalent toCPh)(3)(NMe3) (1) and Ph(2)PCequivalent toCPPh(2) (dppa) produces W(eta(2)-PhCequivalent toCPh)(3)(eta(1)-Ph(2)PCequivalent toCPPh(2)) (2), which contains a pendant phosphine group. Treatment of 2 with W(CO)(4)(NCMe)(2) yields [W(eta(2) -PhCequivalent toCPh)(3)](mu, eta(2)-Ph(2)PCequivalent to CPPh2)[W(CO)(4)(NCMe)] (3). Compound 2 reacts with Os-3(CO)(10)(NCMe)(2) to afford Os-3(CO)(10)[(mu, eta(2)-Ph(2)PCequivalent toCPPh(2))W(eta(2)- PhCequivalent toCPh)(3)](2) (4), and reacts with Ru-3(CO)(9)(NCMe)(3) to afford Ru-3(CO)(9)[(mu,eta(2)-PhPCequivalent toCPPh(2))W(eta(2)-PhCequivalent toCPh)(3)](3) (5). The crystal structures of 2 and 3 are determined by an X-ray diffraction study. (C) 2003 Elsevier B.V. All rights reserved.
WCl(η2-C2Ph2)(η6-C6Ph6H): A Compound Containing a Metallacycloheptatriene Unit from Trimerization of Diphenylacetylene with W(NMe3)(η2-C2Ph2)3
摘要:
W(NCMe)(eta(2)-C2Ph2)(3) (1) has been previously synthesized by the reaction of W(CO)(eta(2)-C2Ph2)3 Wit Me3NO in acetonitrile, while the same treatment in THF leads to the trimethylamine complex W(NMe3)(eta(2)-C2Ph2)(3) (2). Compound 2 is reactive. Stirring a mixture of 2 and diphenylacetylene in dichloromethane at room temperature affords WCl(eta(2)-C2Ph2)(eta(6)-C6Ph6H) (3), which apparently arises from trimerization of the alkyne ligands concomitant with solvent activation. The structures of 1-3 have been determined by an X-ray diffraction study. A carbene W=C double bond is evidenced in 3.