The role of two-component catalysts containing chelating bisaryloxide ligands in controlling the stereochemistry of the metathesis polymerization of norbornene

Denise L. Barnes, Nancy W. Eilerts, Joseph A. Heppert, Wayne H. Huang, Martha D. Morton

Research output: Contribution to journalArticle

22 Scopus citations

Abstract

The ring-opening metathesis polymerization of norbornene and 5,5-dimethylnorbornene has been studied with a range of tungsten(VI) ring-opening metathesis polymerization procatalysts containing chelating diolate ligands, including catechols, 1,8-dihydroxynaphthalene, 1,1′-bi-2-naphthol, biphenanthrol and bis(2-hydroxyphenyl) methane. One class of these catalysts, W(X)(OArO)Cl2(THF) (X = O or NArMe2) was produced via alcoholysis reactions between W(X)Cl4 and the respective diol. Polymers of norbornene produced with these catalysts showed a reasonable correlation between ring size and cis-selectivity. This effect is most likely steric in origin. Analyses of the tacticity of poly-5,5-dimethylnorbornene showed a correlation betwen high cis-olefin content and syndiotacticity, even when produced with catalysts containing asymmetric chelating diolate ligands.

Original languageEnglish (US)
Pages (from-to)1267-1275
Number of pages9
JournalPolyhedron
Volume13
Issue number8
DOIs
StatePublished - Apr 1994
Externally publishedYes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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