The reaction of 1,2,4triazolo4,3-apyridinium 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 = 1,2,4triazolo4,3-apyridin-3-ylidene), and their structures were analysed by X-ray diffractometry and spectroscopic techniques. The sigma-donor ability of the new ligands was estimated by comparative analysis of infrared nu(CO) 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.
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