title: Pyracene-linked bis-imidazolylidene complexes of palladium and some catalytic benefits produced by bimetallic catalysts.
abstract: Two new palladium complexes with a pyracene-linked bis-imidazolylidene (pyrabim) group have been obtained and fully characterized. The related monometallic analogues were obtained from the coordination of an acetanaphthene-supported N-heterocyclic carbene (NHC). The catalytic properties of all complexes were studied in the acylation of aryl halides with hydrocinnamaldehyde, and in the Suzuki-Miyaura coupling of aryl halides and aryl boronic acids. The results show that the presence of a second metal in the dimetallic complexes induces some benefits in the catalytic behavior of the complexes. This effect is more pronounced in the Suzuki-Miyaura coupling, for which the dimetallic complexes exhibit significantly higher activity than their monometallic counterparts.
authors.affiliation: Departamento de Química Inorgánica y Orgánica, Universitat Jaume I, 12071-Castellón, Spain.
authors.forename: Gregorio
authors.initials: G
authors.lastname: Guisado-Barrios
authors.forename: Joanna
authors.initials: J
authors.lastname: Hiller
authors.forename: Eduardo
authors.initials: E
authors.lastname: Peris
keywords: CC coupling; acylation; carbenes; homogeneous catalysis; palladium