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Molecules 2014, 19(5), 5522-5537; doi:10.3390/molecules19055522
Article

Improved Metathesis Lifetime: Chelating Pyridinyl-Alcoholato Ligands in the Second Generation Grubbs Precatalyst

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 and *
Research Focus Area for Chemical Resource Beneficiation, Catalysis and Synthesis Research Group, North-West University, Potchefstroom 2520, South Africa
* Author to whom correspondence should be addressed.
Received: 16 March 2014 / Revised: 22 April 2014 / Accepted: 24 April 2014 / Published: 29 April 2014
(This article belongs to the Special Issue Ruthenium Complex)
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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.
Keywords: second generation grubbs precatalyst; pyridinyl-alcoholato ligand; 1-octene metathesis; lifetime second generation grubbs precatalyst; pyridinyl-alcoholato ligand; 1-octene metathesis; lifetime
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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du Toit, J.I.; Jordaan, M.; Huijsmans, C.A.A.; Jordaan, J.H.L.; van Sittert, C.G.C.E.; Vosloo, H.C.M. Improved Metathesis Lifetime: Chelating Pyridinyl-Alcoholato Ligands in the Second Generation Grubbs Precatalyst. Molecules 2014, 19, 5522-5537.

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