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Open Access item Synthesis, structure and properties of [1,2,4]triazolo[4,3-a]pyridin-3-ylidene rhodium and palladium complexes

Authors:Iglesias-Sigüenza, Javier
Ros, Abel
Díez, Elena
Alcarazo, Manuel
Álvarez, Eleuterio
Fernández, Rosario
Lassaletta, José M.
Keywords:Rhodium, Palladium, NHC
Issue Date:21-Jul-2009
Publisher:Royal Society of Chemistry (Great Britain)
Citation:Dalton Transactions (35) : 7113-7120 (2009)
Abstract:The reaction of [1,2,4]triazolo[4,3-a]pyridinium tetrafluoroborates with [RhCl(COD)]2 and [PdCl(allyl)]2 takes place under mild basic conditions (Et3N, THF, room temperature) to afford the corresponding [RhCl(COD)(Tripy)] and [PdCl(allyl)(Tripy)] complexes, respectively (Tripy = [1,2,4]triazolo[4,3-a]pyridin-3-ylidene), and their structures were analysed by X-ray diffractometry and spectroscopic techniques. The σ-donor ability of the new ligands was estimated by comparative analysis of infrared νCO stretching frequencies of [RhCl(CO)2(Tripy)] complexes, and proved to be strongly dependent on the substitution pattern. Additionally, a first insight into the catalytic properties of the latter in the Suzuki–Miyaura cross coupling demonstrates a good catalytic activity that enables the coupling of aryl chlorides at room temperature.
Description:8 páginas, 5 figuras, 2 tablas, 5 esquemas.
Publisher version (URL):http://dx.doi.org/10.1039/B907043E
Appears in Collections:(IIQ) Artículos

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