Polymerization of Allenes by Using an Iron(II) β-Diketiminate Pre-Catalyst to Generate High M n Polymers

Callum Woof, Derek J Durand, Ruth Webster

Research output: Contribution to journalArticlepeer-review

Abstract



Herein, we report an iron(II)-catalyzed polymerization of arylallenes. This reaction proceeds rapidly at room temperature in the presence of a hydride co-catalyst to generate polymers of weight up to Mn=189 000 Da. We have determined the polymer structure and chain length for a range of monomers through a combination of NMR, differential scanning calorimetry (DSC) and gel permeation chromatography (GPC) analysis. Mechanistically, we postulate that the co-catalyst does not react to form an iron(II) hydride in situ, but instead the chain growth is proceeding via a reactive Fe(III) species. We have also performed kinetic and isotopic experiments to further our understanding. The formation of a highly unusual 1,3-substituted cyclobutane side-product is also investigated.
Original languageEnglish
Pages (from-to)12335-12340
Number of pages6
JournalChemistry - A European Journal
Volume27
Issue number48
Early online date16 Jul 2021
DOIs
Publication statusPublished - 25 Aug 2021

Keywords

  • allenes
  • cycloaddition
  • homogeneous catalysis
  • iron
  • polymers

ASJC Scopus subject areas

  • Catalysis
  • Organic Chemistry

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