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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

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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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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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Catalysis

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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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Simple Methods for the Preparation of Non-noble Metal Bulk-electrodes for Electrocatalytic Applications
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Electrocatalytic metal hydride generation using CPET mediators.

Subal Dey1,2, Fabio Masero1, Enzo Brack1

  • 1Department of Chemistry and Applied Biosciences, ETH Zürich, Zurich, Switzerland.

Nature
|July 21, 2022
PubMed
Summary

We developed a new method for generating transition metal hydrides (M-H) using concerted proton-electron transfer (CPET) mediators. This strategy enhances the electrocatalytic conversion of CO2 to formic acid (HCOOH), improving energy efficiency.

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Area of Science:

  • Catalysis
  • Electrochemistry
  • Materials Science

Background:

  • Transition metal hydrides (M-H) are crucial intermediates in catalysis and enzymatic reactions, involved in H+/H2 interconversion and CO2 reduction.
  • Efficient M-H formation is key to improving energy efficiency in catalytic processes.
  • Selective electrochemical CO2 reduction to formic acid (HCOOH) requires facile M-H generation using mild proton sources.

Purpose of the Study:

  • To introduce a novel strategy for electrocatalytic M-H generation using concerted proton-electron transfer (CPET) mediators.
  • To evaluate the efficiency of manganese hydride (Mn-H) generation for CO2 electroreduction to HCOOH.
  • To identify optimal CPET mediators for enhancing HCOOH production selectivity.

Main Methods:

  • Investigated CPET mediators in combination with the [MnI(bpy)(CO)3Br] catalyst for CO2 electroreduction.
  • Probed the reversal of product selectivity from CO to HCOOH to assess Mn-H generation.
  • Employed in situ spectroscopic techniques to demonstrate Mn-H formation and determine thermodynamic boundaries.

Main Results:

  • Demonstrated electrocatalytic M-H generation using CPET mediators.
  • Achieved enhanced selectivity towards HCOOH production over CO.
  • Identified a synthetic iron-sulfur cluster as a superior CPET mediator for HCOOH generation.

Conclusions:

  • The CPET mediator strategy enables efficient and selective electrocatalytic M-H generation.
  • This approach provides a benchmark catalytic system for formic acid production from CO2.
  • The findings pave the way for improved energy efficiency in CO2 utilization.