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Olefin Metathesis Polymerization: Overview01:13

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Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
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The acid-catalyzed addition of water to the double bond of alkenes is a large-scale industrial method used to synthesize low-molecular-weight alcohols. An acidic atmosphere is required to allow the hydrogen in the water molecule to act as an electrophile and attack the double bond in an alkene. The addition of a proton to the double bond creates a carbocation intermediate. The proton preferentially bonds to the less substituted end of the double bond to create a more stable carbocation...
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Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
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Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
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In addition to the oxymercuration–demercuration method, which converts the alkenes to alcohols with Markovnikov orientation, a complementary hydroboration-oxidation method yields the anti-Markovnikov product. The hydroboration reaction, discovered in 1959 by H.C. Brown, involves the addition of a B–H bond of borane to an alkene giving an organoborane intermediate. The oxidation of this intermediate with basic hydrogen peroxide forms an alcohol.
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A quantitative multiscale perspective on primary olefin formation from methanol.

Toyin Omojola1,2, Andrew J Logsdail3, André C van Veen2

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Summary
This summary is machine-generated.

Researchers investigated methanol conversion to olefins over zeolites, revealing reaction barriers are competitive with adsorption/desorption energies. Facile diffusion within catalysts governs activity in this key chemical process.

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Area of Science:

  • Catalysis
  • Chemical Engineering
  • Materials Science

Background:

  • Methanol conversion to olefins over zeolite catalysts is a critical industrial process.
  • Over 20 mechanisms have been proposed for the initial C-C bond formation, highlighting complexity.

Purpose of the Study:

  • To quantitatively decouple adsorption, desorption, mobility, and surface reactions of early species.
  • To provide molecular insights into catalytic activity governing methanol-to-olefin conversion.

Main Methods:

  • Utilized vacuum and sub-vacuum Temporal Analysis of Products (TAP) reactor systems.
  • Employed atmospheric fixed-bed reactors, density functional theory (DFT) calculations, and data-driven physical models.
  • Analyzed effects of steam, degradation species, and product masking.

Main Results:

  • Reaction barriers were found to be competitive with adsorption enthalpies and/or desorption activation energies.
  • Facile diffusion of species within the porous zeolite structures was observed.
  • Quantitative evaluation of competing energetics provided molecular-level understanding.

Conclusions:

  • The study offers a multiscale perspective on methanol-to-olefin conversion over zeolites.
  • Understanding competing energetics is key to controlling catalytic activity.
  • Further quantitative spectroscopic studies are needed to fully elucidate adspecies behavior.