Stereoelectronic effects characterizing nucleophilic carbene ligands bound to the Cp*RuCl (Cp* = eta(5)-C5Me5) moiety: A structural and thermochemical investigation

J K Huang, H J Schanz, E D Stevens, Steven Patrick Nolan

Research output: Contribution to journalArticlepeer-review

Abstract

The reaction of [Cp*RuCl](4) (1) with carbene ligands affords unsaturated Cp*Ru(L)Cl [Cp* = eta(5)-C5Me5; L = 1,3-R-2-imidazol-2-ylidene [R = cyclohexyl (ICy, 2); 4-methylphenyl (ITol, 3); 4-chlorophenyl (IpCl, 4); adamantyl (IAd, 5)] and 4,5-dichloro-1,3-bis(2,4,6-trimethylphenyl)imidazol-2-ylidene (IMesCl, 6)] complexes 2-6 in high yield. Solution calorimetric investigations of this series provides a measure of the electron donor properties of all ligands, and comparisons are made with IMes [1,3-bis(2,4,6-trimethylphenyl)imidazol-2-ylidene] and the widely used PCy3. Structural information from single X-ray studies for complexes 2, 3, 5, 6, Cp*Ru(IMes)Cl (7), Cp*Ru(PCy3)Cl (8), and Cp*Ru((PPr3)-Pr-i)Cl (9) permits a quantitative treatment of steric parameters associated with these Ligands.

Original languageEnglish
Pages (from-to)2370-2375
Number of pages6
JournalOrganometallics
Volume18
Issue number12
DOIs
Publication statusPublished - 7 Jun 1999

Keywords

  • TERTIARY PHOSPHINE-LIGANDS
  • COMPLEXES
  • BOND
  • COORDINATION
  • METATHESIS
  • HYDROGEN
  • ENERGIES
  • DIENES

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