Jinkun Huang, H. Schanz, E. Stevens
Nov 17, 1999
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Quality indicators
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Organometallics
Abstract
The exchange reaction of one phosphine ligand in Cl2(PCy3)2RuCHPh (1; Cy = cyclohexyl, C6H11) with the sterically demanding carbene ligands 1,3-bis(2,4,6-trimethylphenyl)imidazol-2-ylidene (IMes), 1,3-bis(4-methylphenyl)imidazol-2-ylidene (ITol), and 1,3-bis(4-chlorophenyl)imidazol-2-ylidene (IpCl) leads to the isolation of the new complexes (PCy3)(IMes)Cl2RuCHPh (2), (PCy3)(ITol)Cl2RuCHPh (3), and (PCy3)(IpCl)Cl2RuCHPh (4). Similarly, one IMes ligand can be substituted for one PCyp3 ligand in Cl2(PCyp3)2RuCHCHC(CH3)2 (5; Cyp = cyclopentyl, C5H9) to produce (PCyp3)(IMes)Cl2RuCHPh (6) in high yield. X-ray structure analysis of 6 confirmed a near-square-pyramidal coordination sphere around the metal center. Improved catalytic properties and thermal stability are observed for 2 and 6 in comparison to the parent 1 and 5.