Abstract
A well-defined silica-supported monoalkylated tungsten dioxo complex [(Si-O-)W(=O)2(CH2-tBu)] was prepared by treatment of highly dehydroxylated silica (SiO2-700: silica treated at 700 °C under high vacuum) with an ionic precursor complex [NEt4][W(=O)3(CH2-tBu)]. The identity of the resulting neutral monoalkylated tungsten dioxo surface complex was established by means of elemental microanalysis and spectroscopic studies (IR, solid-state NMR, Raman, and X-ray absorption spectroscopies). The supported tungsten complex was found to act as a precatalyst for the self-metathesis of 1-octene in a batch reactor. The mechanistic implications of this reaction are discussed with the support of DFT calculations highlighting the potential occurrence of thus-far unexplored mechanistic pathways.
Original language | English (US) |
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Pages (from-to) | 2715-2729 |
Number of pages | 15 |
Journal | ACS Catalysis |
Volume | 8 |
Issue number | 4 |
DOIs | |
State | Published - Apr 6 2018 |
Keywords
- Olefin metathesis
- mechanistic study
- metallacyclobutane intermediate
- tungsten alkylidene
- tungsten dioxo complex
ASJC Scopus subject areas
- General Chemistry
- Catalysis