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Dimeric palladium 1,2,3-triazol-5-ylidene complexes – synthesis, structure, reactivity and catalytic properties in Suzuki coupling

Abstract

New dimeric palladium 1,2,3-triazol-5-ylidene complexes of the general formula [{Pd(µ–Cl)Cl(tzNHC)}2] (tzNHC = 1-mesityl-3-methyl-4-phenyl-1H-1,2,3-triazol-5-ylidene; 1-hexyl-3-methyl-4-phenyl-1H-1,2,3-triazol-5-ylidene and 1-butyl-3-methyl-4-phenyl-1H-1,2,3-triazol-5-ylidene) were synthesized and characterized by spectroscopic methods, X-ray analysis and DFT calculations. For the mesityl substituted complex, crystallographic structures of both the cisoidal and transoidal isomer were obtained. In the presence of an excess of 4-tolylboronic acid, the loss of tzNHC ligand from the palladium coordination sphere as 5-tolyltriazolium salt was observed. The complexes are precursors of palladium species catalytically active in coupling of arylboronic acids with aryl bromides.

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Publication details

The article was received on 27 Feb 2018, accepted on 11 May 2018 and first published on 11 May 2018


Article type: Paper
DOI: 10.1039/C8NJ00981C
Citation: New J. Chem., 2018, Accepted Manuscript
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    Dimeric palladium 1,2,3-triazol-5-ylidene complexes – synthesis, structure, reactivity and catalytic properties in Suzuki coupling

    J. Lorkowski, P. Żak, M. Kubicki, C. Pietraszuk, D. Jedrzkiewicz and J. Ejfler, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8NJ00981C

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