Exploiting Confinement Effects to Tune Selectivity in Cyclooctane Metathesis

Eva Pump, Zhen Cao, Manoja Samantaray, Anissa Bendjeriou-Sedjerari, Luigi Cavallo, Jean-Marie Basset

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

The mechanism of cyclooctane metathesis using confinement effect strategies in mesoporous silica nanoparticles (MSNs) is discussed by catalytic experiments and density functional theory (DFT) calculations. WMe6 was immobilized inside the pores of a series of MSNs having the same structure but different pore diameters (60, 30 and 25 Å). Experiments in cyclooctane metathesis suggest that confinement effects observed in smaller pores (30 and 25 Å) improve selectivity towards the dimeric cyclohexadecane. In contrast, in larger pores (60 Å) a broad product distribution dominated by ring contracted cycloalkanes was found. The catalytic cycle and potential side reactions occurring at [(≡SiO-)WMe5] were examined with DFT calculations. Analysis of the geometries for the key reaction intermediates allowed to rationalize the impact of a confined environment on the enhanced selectivity towards the dimeric product in smaller pores, while in large pores the ring contracted products are favored.
Original languageEnglish (US)
Pages (from-to)6581-6586
Number of pages6
JournalACS Catalysis
Volume7
Issue number10
DOIs
StatePublished - Aug 31 2017

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