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Ruthenium Olefin Metathesis Catalysts Bearing a Macrocyclic N‐Heterocyclic Carbene Ligand: Improved Stability and Activity

Autor
Kajetanowicz, Anna
Malińska, Maura
Woźniak, Krzysztof
Grela, Karol
Trzaskowski, Bartosz
Janaszkiewicz, Angelika
Śnieżek, Marcin
Lichosyt, Dawid
Kośnik, Wioletta
Data publikacji
2022
Abstrakt (EN)

Formation of sterically hindered C−C double bonds via catalytic olefin metathesis is considered a very challenging task for Ru catalysts. This limitation led to the development of specialised catalysts bearing sterically reduced N-heterocyclic carbene (NHC) ligands that are very active in such transformations, yet significantly less stable as compared to general purpose catalysts. To decrease the small-size NHC catalysts susceptibility to decomposition, a new NHC ligand was designed, in which two sterically reduced aryl arms were tied together by a C-8 alkyl chain. The installation of this macrocyclic ligand on the ruthenium centre led to the formation of an olefin metathesis catalyst (trans-Ru6). Interestingly, this complex undergoes transformation into an isomer bearing two Cl ligands in the cis-arrangement (cis-Ru6). These two isomeric complexes exhibit similarly high thermodynamic stability, yet different application profiles in catalysis.

Dyscyplina PBN
nauki chemiczne
Czasopismo
Angewandte Chemie - International Edition
Tom
61
Zeszyt
24
Strony od-do
e202201472
ISSN
1433-7851
Data udostępnienia w otwartym dostępie
2022-03-29
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Uznanie autorstwa