Schrock metathesis catalysts

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Schrock metathesis catalysts

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.

Careful balance of catalyst, monomer, and other factors can offer excellent control of the polymer structure.

Biorefineries-possible synthetic routes

Secondary metathesis reactions controlled by catalyst choice and reaction conditions also affect the product distribution. Chain transfer cross metathesis between a growing polymer unit and an adjacent polymer alkene also leads to broadened molecular weights. Chain transfer can also be used to improve processability of the resulting polymer — addition of an acyclic olefin chain-transfer agent can limit chain molecular weights and introduce terminal functional groups.

Ring-opening metathesis polymerization has achieved some commercial success, with a variety of ROMP polymers available on the market: Dicyclopentadiene is particularly well-suited to commercial ROMP, as the monomer contains two double bonds of unequal reactivity — a strained norbornene bond that undergoes rapid olefin metathesis, and a cyclopentene bond that can ring-open depending on polymerization conditions to give a cross-linked polymer.

Schrock metathesis catalysts

Living Ring-opening metathesis polymerization. Prog Polym Sci 32,p1. Macromol Rapid Commun 25,p Industrial applications of olefin metathesis. J Mol Cat A: Chemical, In Handbook of Metathesis; Grubbs, R.Professor Omar M.

Schrock metathesis catalysts

Yaghi University of Berkeley (United States) Omar M. Yaghi is the James and Neeltje Tretter Chair Professor of Chemistry at the University of California, Berkeley, and a Senior Faculty Scientist at Lawrence Berkeley National Laboratory.

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Olefin Metathesis. Olefin metathesis is a chemical reaction in which a molecule with a pair of carbon-carbon double bonds, known also as olefins or hydrocarbons, come together and exchange carbon atoms with one another, forming new value-added molecules in the process.

Olefin Metathesis. Olefin metathesis is a chemical reaction in which a molecule with a pair of carbon-carbon double bonds, known also as olefins or hydrocarbons, come together and exchange carbon atoms with one another, forming new value-added molecules in the process.

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