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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 radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this...
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Ring-Expansion Metathesis Polymerization under Confinement.

Patrick Probst1, Moritz Lindemann1, Johanna R Bruckner2

  • 1Institute of Polymer Chemistry, University of Stuttgart, Pfaffenwaldring 55, Stuttgart 70569, Germany.

Journal of the American Chemical Society
|February 26, 2025
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Summary
This summary is machine-generated.

Immobilizing a molybdenum complex in ordered mesoporous silica enhances ring-expansion metathesis polymerization. This confinement enables the synthesis of low-molecular-weight cyclic polymers with controlled stereoselectivity.

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Area of Science:

  • Organometallic Chemistry
  • Polymer Chemistry
  • Materials Science

Background:

  • Catalysis using transition metal complexes is crucial for polymer synthesis.
  • Confining catalysts within porous materials can alter reactivity and selectivity.
  • Ordered mesoporous silica (OMS) offers tunable pore sizes for catalyst immobilization.

Purpose of the Study:

  • To immobilize a cationic molybdenum alkylidyne N-heterocyclic carbene (NHC) complex within OMS.
  • To investigate the effect of pore confinement on ring-expansion metathesis polymerization (REMP) of cyclic olefins.
  • To explore the influence of confinement on polymer molecular weight and stereoselectivity.

Main Methods:

  • Synthesis and characterization of the molybdenum NHC complex [Mo(C-p-OMeC6H4)(OCMe(CF3)2)2(IMes)][B(ArF4].
  • Immobilization of the complex into OMS with varying pore sizes (66, 56, and 28 Å).
  • Ring-expansion metathesis polymerization (REMP) of cyclic olefins including cis-cyclooctene (cCOE), 1,5-cyclooctadiene (COD), (+)-2,3-endo,exo-dicarbomethoxynorborn-5-ene ((+)-DCMNBE), and 2-methyl-2-phenylcycloprop-1-ene (MPCP).
  • Analysis of polymer products using matrix-assisted laser desorption ionization time-of-flight (MALDI-TOF) mass spectrometry.

Main Results:

  • Selective immobilization of the molybdenum complex within OMS pores.
  • Observation of a strong confinement effect on REMP, leading to low-molecular-weight cyclic polymers even at high monomer concentrations.
  • Exclusive formation of cyclic polymers confirmed by MALDI-TOF.
  • Confinement-induced enhancement of Z-selectivity and cis-syndiospecificity.

Conclusions:

  • Confinement of molybdenum NHC catalysts in OMS is an effective strategy for controlling REMP.
  • The pore size of OMS significantly influences the polymerization outcome, enabling the synthesis of cyclic polymers with tailored properties.
  • This approach offers a pathway to precisely control polymer architecture and stereochemistry through catalyst confinement.