Bond metathesis

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Bond metathesis

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.

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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. Secondary metathesis reactions controlled by catalyst choice and reaction conditions also affect the product distribution.

Bond metathesis

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.

Olefin metathesis - Wikipedia

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.

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.The research program of the Feringa group is focussed on synthetic and physical organic chemistry, and nanotechnology.

PowerPoint Slideshow about 'Sigma-bond metathesis' - dextra

Herein, we disclose the first examples of the σ-bond metathesis of silylated alkynes with aromatic carboxylic acids on the Ag() and Au() surfaces to give the corresponding terminal alkynes and silyl esters, which is supported by density functional theory calculations and further confirmed by X-ray photoelectron spectroscopy analysis.

In the medium term: Effects of the reaction medium can be used to alter the reactivity and selectivity in synthetically useful procedures for the functionalization of aliphatic C−H leslutinsduphoenix.com Review discusses the mechanistic features in terms of hydrogen bonding and acid–base interactions and shows that these effects can promote aliphatic C−H bond (de)activation toward hydrogen atom.

In the medium term: Effects of the reaction medium can be used to alter the reactivity and selectivity in synthetically useful procedures for the functionalization of aliphatic C−H leslutinsduphoenix.com Review discusses the mechanistic features in terms of hydrogen bonding and acid–base interactions and shows that these effects can promote aliphatic C−H bond (de)activation toward hydrogen atom.

All Mechanisms: Displaying mechanisms: Alicyclic- electrophilic addition of bromine to cyclohexene (bromonium ion opening) Alicyclic- Grobb rearrangement.

Sigma bond metathesis is basically an "exchange" of a sigma bond that typically occurs with the transition metals on the first few columns (the "early" transition metals) that are in their highest oxidation state.

Enyne Metathesis