Grafted metallo-carbynes as bifunctional pre-catalysts for ROMP of cyclo-octene and cyclic alkane metathesis

Wiebke Wackerow; Manoja Samantaray; Jean-Marie Basset

doi:10.1002/cctc.202001040

Grafted metallo-carbynes as bifunctional pre-catalysts for ROMP of cyclo-octene and cyclic alkane metathesis

Wiebke Wackerow, Manoja Samantaray, Jean-Marie Basset

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

Metallo-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.

Original language	English (US)
Journal	ChemCatChem
DOIs	https://doi.org/10.1002/cctc.202001040
State	Published - Aug 13 2020

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: We would like to acknowledge King Abdullah University of Science and Technology for funding. We also acknowledge the NMR core lab for their continuous help.

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10.1002/cctc.202001040

https://repository.kaust.edu.sa/bitstream/10754/664647/1/Grafted_cctc.202001040.pdf

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@article{40736df5443547eb821de0b3f6c3bff2,

title = "Grafted metallo-carbynes as bifunctional pre-catalysts for ROMP of cyclo-octene and cyclic alkane metathesis",

abstract = "Metallo-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.",

author = "Wiebke Wackerow and Manoja Samantaray and Jean-Marie Basset",

note = "KAUST Repository Item: Exported on 2020-10-01 Acknowledgements: We would like to acknowledge King Abdullah University of Science and Technology for funding. We also acknowledge the NMR core lab for their continuous help.",

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AU - Wackerow, Wiebke

AU - Samantaray, Manoja

AU - Basset, Jean-Marie

N1 - KAUST Repository Item: Exported on 2020-10-01 Acknowledgements: We would like to acknowledge King Abdullah University of Science and Technology for funding. We also acknowledge the NMR core lab for their continuous help.

PY - 2020/8/13

Y1 - 2020/8/13

N2 - Metallo-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.

AB - Metallo-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.

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Grafted metallo-carbynes as bifunctional pre-catalysts for ROMP of cyclo-octene and cyclic alkane metathesis

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