Grafted metallo-carbynes as bifunctional pre-catalysts for ROMP of cyclo-octene and cyclic alkane metathesis
KAUST DepartmentChemical Science Program
Physical Science and Engineering (PSE) Division
KAUST Catalysis Center (KCC)
Online Publication Date2020-09-09
Print Publication Date2020-11-19
Embargo End Date2021-08-13
Permanent link to this recordhttp://hdl.handle.net/10754/664647
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AbstractMetallo-carbynes grafted on mesoporous fibrous silica are active towards alkane metathesis. We are comparing the activity of well-defined grafted pre-catalysts (≡Si-O-)W(≡CCMe3)(-CH2CMe3)2, (≡Si-O-)W(≡CH)(-CH3)2 and (≡Si-O-)Mo(≡CCMe3)(-CH2CMe3)2 for Ring Opening Metathesis Polymerization of cyclo-octene and metathesis of cyclo-octane. This comparison is because olefins are assumed to be intermediate products in alkane metathesis. The three pre-catalysts are active in cyclo-octane metathesis, and give the higher, and lower cyclic homologues. However, with cyclo-octene the three catalysts give polyoctenamer by classical ROMP. It is assumed that the metallo-carbynes react differently towards cyclo-alkanes and cyclo-olefins. In one case, with cyclo-alkanes they give a metallo-carbene alkyl and in the other case with cyclo-olefins they give a bis-carbene.
CitationWackerow, W., Samantaray, M. K., & Basset, J.-M. (2020). Grafted metallo-carbynes as bifunctional pre-catalysts for ROMP of cyclo-octene and cyclic alkane metathesis. ChemCatChem. doi:10.1002/cctc.202001040
SponsorsWe would like to acknowledge King Abdullah University of Science and Technology for funding. We also acknowledge the NMR core lab for their continuous help.