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- Title
Improved Metathesis Lifetime: Chelating Pyridinyl-Alcoholato Ligands in the Second Generation Grubbs Precatalyst.
- Authors
du Toit, Jean I.; Jordaan, Margaritha; Huijsmans, Carlijn A. A.; Jordaan, Johannes H. L.; van Sittert, Cornelia G. C. E.; Vosloo, Hermanus C. M.
- Abstract
Hemilabile ligands can release a free coordination site "on demand" of an incoming nucleophilic substrate while occupying it otherwise. This is believed to increase the thermal stability and activity of catalytic systems and therefore prevent decomposition via free coordination sites. In this investigation chelating pyridinyl-alcoholato ligands were identified as possible hemilabile ligands for incorporation into the second generation Grubbs precatalyst. The O,N-alcoholato ligands with different steric bulk could be successfully incorporated into the precatalysts. The incorporation of the sterically hindered, hemilabile O,N-ligands improved the thermal stability, activity, selectivity and lifetime of these complexes towards the metathesis of 1-octene. A decrease in the activity of the second generation Grubbs precatalyst was additionally observed after incorporating a hemilabile O,N-ligand with two phenyl groups into the system, while increasing their lifetime.
- Subjects
METATHESIS reactions; LIGANDS (Biochemistry); THERMAL stability; PROPERTIES of matter; CATALYTIC antibodies; CHEMICAL synthesis
- Publication
Molecules, 2014, Vol 19, Issue 5, p5522
- ISSN
1420-3049
- Publication type
Article
- DOI
10.3390/molecules19055522