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Influence of sterically demanding carbene ligation on catalytic behavior and thermal stability of ruthenium olefin metathesis catalysts

(1999) ORGANOMETALLICS. 18(25). p.5375-5380
Author
Organization
Abstract
The exchange reaction of one phosphine ligand in Cl-2(PCy3)(2)Ru=CHPh (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-yliden (ITol), and 1,3-bis(4-chlorophenyl)imidazol-2-ylidene (IpCl) leads to the isolation of the new complexes (PCy3)(IMes)Cl2Ru=CHPh (2), (PCy3)(ITol)Cl2Ru=CHPh (3), and (PCy3)(IpCl)Cl2Ru=CHPh (4). Similarly, one IMes ligand can be substituted for one PCyp(3) ligand in Cl-2(PCyp(3))(2)Ru=CHCH=C(CH3)(2) (5; Cyp = cyclopentyl, C5H9) to produce (PCyp(3))(IMes)Cl2Ru=CHPh (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.
Keywords
N-HETEROCYCLIC CARBENES, STRAIN CYCLIC OLEFINS, POLYMERIZATION, COMPLEXES, RUCL2(=CHR')(PR(3))(2), NORBORNENE, WATER, ROMP

Citation

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MLA
Huang, JK, et al. “Influence of Sterically Demanding Carbene Ligation on Catalytic Behavior and Thermal Stability of Ruthenium Olefin Metathesis Catalysts.” ORGANOMETALLICS, vol. 18, no. 25, 1999, pp. 5375–80.
APA
Huang, J., Schanz, H., Stevens, E., & Nolan, S. (1999). Influence of sterically demanding carbene ligation on catalytic behavior and thermal stability of ruthenium olefin metathesis catalysts. ORGANOMETALLICS, 18(25), 5375–5380.
Chicago author-date
Huang, JK, HJ Schanz, ED Stevens, and Steven Nolan. 1999. “Influence of Sterically Demanding Carbene Ligation on Catalytic Behavior and Thermal Stability of Ruthenium Olefin Metathesis Catalysts.” ORGANOMETALLICS 18 (25): 5375–80.
Chicago author-date (all authors)
Huang, JK, HJ Schanz, ED Stevens, and Steven Nolan. 1999. “Influence of Sterically Demanding Carbene Ligation on Catalytic Behavior and Thermal Stability of Ruthenium Olefin Metathesis Catalysts.” ORGANOMETALLICS 18 (25): 5375–5380.
Vancouver
1.
Huang J, Schanz H, Stevens E, Nolan S. Influence of sterically demanding carbene ligation on catalytic behavior and thermal stability of ruthenium olefin metathesis catalysts. ORGANOMETALLICS. 1999;18(25):5375–80.
IEEE
[1]
J. Huang, H. Schanz, E. Stevens, and S. Nolan, “Influence of sterically demanding carbene ligation on catalytic behavior and thermal stability of ruthenium olefin metathesis catalysts,” ORGANOMETALLICS, vol. 18, no. 25, pp. 5375–5380, 1999.
@article{8170869,
  abstract     = {The exchange reaction of one phosphine ligand in Cl-2(PCy3)(2)Ru=CHPh (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-yliden (ITol), and 1,3-bis(4-chlorophenyl)imidazol-2-ylidene (IpCl) leads to the isolation of the new complexes (PCy3)(IMes)Cl2Ru=CHPh (2), (PCy3)(ITol)Cl2Ru=CHPh (3), and (PCy3)(IpCl)Cl2Ru=CHPh (4). Similarly, one IMes ligand can be substituted for one PCyp(3) ligand in Cl-2(PCyp(3))(2)Ru=CHCH=C(CH3)(2) (5; Cyp = cyclopentyl, C5H9) to produce (PCyp(3))(IMes)Cl2Ru=CHPh (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.},
  author       = {Huang, JK and Schanz, HJ and Stevens, ED and Nolan, Steven},
  issn         = {0276-7333},
  journal      = {ORGANOMETALLICS},
  keywords     = {N-HETEROCYCLIC CARBENES,STRAIN CYCLIC OLEFINS,POLYMERIZATION,COMPLEXES,RUCL2(=CHR')(PR(3))(2),NORBORNENE,WATER,ROMP},
  language     = {eng},
  number       = {25},
  pages        = {5375--5380},
  title        = {Influence of sterically demanding carbene ligation on catalytic behavior and thermal stability of ruthenium olefin metathesis catalysts},
  url          = {http://dx.doi.org/10.1021/om990788y},
  volume       = {18},
  year         = {1999},
}

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