Grafting mechanism and olefin metathesis activity of well-defined silica-supported Mo imido alkyl alkylidene complexes

Frédéric Blanc, Alain Salameh, Jean Thivolle-Cazat, Jean-Marie Maurice Basset, Christophe Copéret*, Amritanshu Sinha, Richard R. Schrock

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

Grafting of [Mo(NAr)({double bond, long}CHCMe2R)(CH2tBu)2], 1-R (R = Me or Ph) on the surface silanols of SiO2-(700) gives 2-R through the electrophilic cleavage of the Mo-C σ-bond according to labelling (GC/MS and solid-state NMR) and reactivity studies (monitoring initiation). Similarly, molecular silanol derivatives react with 1-Ph also to give directly the monosiloxy derivatives. Therefore, surface or molecular silanols have reactivities similar to alcohols and phenols having pKa ≥ 9. Finally, the surface complex 2-R (R = Me or Ph) is a highly efficient olefin metathesis catalyst.

Original languageEnglish (US)
Pages (from-to)137-146
Number of pages10
JournalComptes Rendus Chimie
Volume11
Issue number1-2
DOIs
StatePublished - Jan 1 2008

Keywords

  • Heterogeneous catalysis
  • Mo imido alkylidene
  • Olefin metathesis
  • Silica
  • Surface organometallic chemistry

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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