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    An Enantiomerically Pure Adamantylimido Molybdenum Alkylidene Complex. An Effective New Catalyst for Enantioselective Olefin Metathesis
    Journal of the American Chemical Society (2003)
    W. C. Peter TsangJesper A. JerneliusG. A. CortezGabriel S. WeatherheadRichard R. SchrockAmir H. Hoveyda
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    Abstract:
    An enantiomerically pure Mo-based complex that bears an alkylimido ligand is prepared and characterized through NMR spectroscopy and X-ray analysis. Mo complex 4 is the only reported chiral alkylimido catalyst; all previous chiral complexes are arylimido systems. These studies show that the chiral Mo catalyst exists exclusively as the syn isomer and that it offers unique reactivity and selectivity profiles in asymmetric olefin metathesis.
    Keywords:
    Olefin Metathesis
    Reactivity
    Topics:
    Synthetic Organic Chemistry Methods
    Chemical Synthesis and Analysis
    Organometallic Complex Synthesis and Catalysis
    Study of the Activity and Stereoselectivity of Some Metathesis Catalysts with Acyclic Internal Olefins
    Springer eBooks (2002)
    F. LefebvreX. Bories-AzeauJean‐Marie Basset
    Olefin Metathesis
    Catalytic cycle
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    Dialkoxydinitrosylmolybdenum compounds as olefin metathesis precatalysts: catalyst formation and electronic structure
    Journal of Molecular Catalysis (1989)
    A. KellerL. Szterenberg
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    Catalytic cycle
    Salt metathesis reaction
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    Olefin metathesis and oligomerization with the catalytic components WBr5−C2H5AlCl2
    Reaction Kinetics and Catalysis Letters (1975)
    Jean VialleJean‐Marie Basset
    Olefin Metathesis
    Limiting
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    Ring-opening metathesis polymerisation
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    Mechanochemical Ruthenium-Catalyzed Olefin Metathesis
    Journal of the American Chemical Society (2015)
    Jean‐Louis DoCristina MottilloDavin TanVjekoslav ŠtrukilTomislav Friščić
    We describe the development of a mechanochemical approach for Ru-catalyzed olefin metathesis, including cross-metathesis and ring-closing metathesis. The method uses commercially available catalysts to achieve high-yielding, rapid, room-temperature metathesis of solid or liquid olefins on a multigram scale using either no or only a catalytic amount of a liquid.
    Olefin Metathesis
    Ring-opening metathesis polymerisation
    Acyclic diene metathesis
    Salt metathesis reaction
    Ring-Closing Metathesis
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    Alkane Metathesis Catalyzed by a Well‐Defined Silica‐Supported Mo Imido Alkylidene Complex: [(SiO)Mo(NAr)(CHtBu)(CH2tBu)]
    Angewandte Chemie International Edition (2006)
    Frédéric BlancChristophe CopéretJean Thivolle‐CazatJean‐Marie Basset
    A two-functions-in-one catalyst precursor allows an olefin metathesis catalyst to be turned into an alkane metathesis catalyst. A silica-supported alkyl alkylidene molybdenum complex containing an ancillary imido ligand is a highly active olefin metathesis catalyst and also acts as a catalyst precursor for alkane metathesis. This system involves a single metal with dual properties and shows that ancillary ligands are compatible with alkane metathesis reactions. Supporting information for this article is available on the WWW under http://www.wiley-vch.de/contents/jc_2002/2006/z602171_s.pdf or from the author. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.
    Alkane
    Olefin Metathesis
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    Ring-opening metathesis polymerisation
    Acyclic diene metathesis
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    High Trans Kinetic Selectivity in Ruthenium-Based Olefin Cross-Metathesis through Stereoretention
    Organic Letters (2016)
    Adam M. JohnsTonia S. AhmedBradford W. JacksonRobert H. GrubbsRichard L. Pederson
    The first kinetically controlled, highly trans-selective (>98%) olefin cross-metathesis reaction is demonstrated using Ru-based catalysts. Reactions with either trans or cis olefins afford products with highly trans or cis stereochemistry, respectively. This E-selective olefin cross-metathesis is shown to occur between two trans olefins and between a trans olefin and a terminal olefin. Additionally, new stereoretentive catalysts have been synthesized for improved reactivity.
    Olefin Metathesis
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    Salt metathesis reaction
    Acyclic diene metathesis
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    Probing the Mechanism of Olefin Metathesis in Grubbs–Hoveyda and Grela Type Complexes
    Angewandte Chemie International Edition (2010)
    Tim VorfaltKlaus‐Jürgen WannowiusHerbert Plenio
    The more the better: Kinetic data derived from UV/Vis spectroscopy (see picture) provide conclusive evidence for participation of the olefinic substrate in the rate-limiting step of the initiation reaction of Grubbs–Hoveyda type olefin metathesis catalysts, and for a second olefin-independent step, which is rate-limiting only at very high olefin concentrations.
    Olefin Metathesis
    Limiting
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    Rate-determining step
    Grubbs' catalyst
    Ring-opening metathesis polymerisation
    Acyclic diene metathesis
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    Application of Uniform Macroporous Polystyrene Particles as Support in W(CO)6/CC14/hv Photocatalytic Olefin Metathesis System
    Springer eBooks (2003)
    Bülent DüzCemil AydoğduYavuz İmamoǧlu
    Olefin Metathesis
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    Polystyrene
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    New fluorinated catalysts for olefin metathesis
    Mendeleev Communications (2016)
    Salekh M. MasoudArtur K. MailyanАlexander S. PeregudovChristian BruneauSergey N. Osipov
    Olefin Metathesis
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    Prevention of Undesirable Isomerization during Olefin Metathesis
    Journal of the American Chemical Society (2005)
    Soon Hyeok HongDaniel P. SandersChoon Woo LeeRobert H. Grubbs
    1,4-Benzoquinones have been found to prevent olefin isomerization of a number of allylic ethers and long-chain aliphatic alkenes during ruthenium-catalyzed olefin metathesis reactions. Electron-deficient benzoquinones are the most effective additives for the prevention of olefin migration. This mild, inexpensive, and effective method to block olefin isomerization increases the synthetic utility of olefin metathesis via improvement of overall product yield and purity.
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