Preparation of tungsten-based olefin metathesis catalysts supported on alumina

Jian Yuan, Erik M. Townsend, Richard R. Schrock, Alan S. Goldman, Peter Müller, Michael K. Takase

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

A new tungsten alkylidene complex, W(NAr)(CHCMe2Ph)(OHIPT- NMe2)(pyrrolide) {Ar=2,6-(i-Pr)2C6H 3; HIPT-NMe2=2,6-[2,4,6-(i-Pr)3C 6H2]2-4-NMe2-C6H 2}, has been synthesized and shown to be highly selective for Z homocoupling metathesis of selected terminal olefins in pentane, as is W(NAr)(CH2CH2CH2)(OHIPT)(pyrrolide) (5). Both 5 and W(NAr)(CHCMe2Ph)(OHIPT-NMe2)(pyrrolide) (6) are adsorbed onto calcined alumina. Control experiments and metathesis homocoupling of four substrates lead to the conclusions that 5 is largely adsorbed in a reaction that liberates HIPTOH, while 6 is adsorbed largely through an interaction between the dimethylamino group and an acidic site on the surface. There is no evidence that any adsorbed catalyst can give rise to Z selectivity of a magnitude equal to that found in a homogeneous reaction involving 5 or 6.

Original languageEnglish
Pages (from-to)1985-1992
Number of pages8
JournalAdvanced Synthesis and Catalysis
Volume353
Issue number11-12
DOIs
Publication statusPublished - Aug 1 2011

Keywords

  • alkylidene species
  • alumina
  • olefin metathesis
  • supported catalysts
  • tungsten

ASJC Scopus subject areas

  • Catalysis
  • Organic Chemistry

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