Decomposition of Olefin Metathesis Catalysts by Brønsted Base: Metallacyclobutane Deprotonation as a Primary Deactivating EventGwendolyn A Bailey, Justin Alexander MacDonald Lummiss, Marco Foscato, Giovanni Occhipinti, Robert McDonald, Vidar …
WATER-SOLUBLE metathesis catalysts promise greener approaches to this chemistry, which typically uses large quantities of solvents to achieve the highly dilute conditions required. Grubbs and graduate student Soon Hyeok Hong reported a variant of the second-generation Hoveyda-Grubbs catalyst that is stable and highly active in water (). They did so by attaching a poly(ethylene glycol) chain to the NHC.
Olefin metathesis for chemical biology.
lefin metathesis is a popular and useful reaction. In the presence of certain transition-metal compounds, including various metal carbenes, olefins exchange the groups around the double bonds, resulting in several outcomes: straight swapping of groups between two acyclic olefins (cross-metathesis), closure of large rings (ring-closing metathesis), formation of dienes from cyclic and acyclic olefins (ring-opening metathesis), polymerization of cyclic olefins (ring-opening metathesis polymeriza
Olefin metathesis is a popular and useful reaction
Ring-opening metathesis polymerization (ROMP) uses metathesis catalysts to generate polymers from cyclic olefins. ROMP is most effective on strained cyclic olefins, because the relief of ring strain is a major driving force for the reaction – cyclooctene and norbornenes are excellent monomers for ROMP, but cyclohexene is very reluctant to form any significant amount of polymer. Norbornenes are favorite monomers for ROMP, as a wide range of monomer functionalities are easily available through Diels-Alder reactions.
Olefin Metathesis - Chemistry LibreTexts
Light- and Thermal-Activated Olefin Metathesis of Hindered SubstratesElisa Ivry, Alexander Frenklah, Yakov Ginzburg, Efrat Levin, Israel Goldberg, Sebastian Kozuch, N. Gabriel Lemcoff, and Eyal Tzur*Organometallics 2018 ASAPRing …
Olefin Metathesis: Catalysts used for this reaction  ..
Olefin metathesis is a chemical reaction in which two carbon-carbon double bonds (olefins) come together and exchange with one another, forming new olefinic products in the process.
Categories of Olefin Metathesis: ..
Metathesis reactions can occur between two when one product is in water, driving the reaction forward. For example, the precipitation of from a mixture of and sodium chloride causes to be left in solution:
Olefin metathesis enables broad commercial …
Careful balance of catalyst, monomer, and other factors can offer excellent control of the polymer structure. In terms of homogeneous catalysts, most tungsten and molybdenum catalysts (Schrock catalysts) have rapid initiation rates and can produce “living” polymerizations with excellent control of polydispersity and chain tacticity, but the low functional group tolerance limits the monomers available. Ruthenium metathesis catalysts (Grubbs catalysts) tend to have slower initiation rates, often leading to higher polydispersities, but their air stability and greater tolerance for functional groups makes them “user friendly” and enables use of a wide range of functional monomers and additives.