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 language | English |
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Pages (from-to) | 2370-2375 |
Number of pages | 6 |
Journal | Organometallics |
Volume | 18 |
Issue number | 12 |
DOIs | |
Publication status | Published - 7 Jun 1999 |
Keywords
- TERTIARY PHOSPHINE-LIGANDS
- COMPLEXES
- BOND
- COORDINATION
- METATHESIS
- HYDROGEN
- ENERGIES
- DIENES