title: Magnetically recoverable catalysts based on mono- or bis-(NHC) complexes of palladium for the Suzuki-Miyaura reaction in aqueous media: two NHC-Pd linkages are better than one.
abstract: Pre-synthesized mono- and bis(NHC) palladium complexes have been grafted onto magnetic core/shell γ-Fe2O3/silica particles and tested as catalysts in model Suzuki-Miyaura coupling reactions. The bis(NHC) immobilized complex was found to be a robust catalyst that can operate under mild conditions in aqueous media, even for the activation of chloroarene, whereas the mono(NHC) counterpart rapidly deactivates. Moreover, it can be readily recovered by magnetic separation and reused many times, providing very high productivities, and with so low leaching of palladium that the crude products obtained contain ≤10 ppm Pd.
authors.affiliation: Departamento de Química Orgánica y Química Inorgánica, Universidad de Alcalá, Campus Universitario, 28871 Alcalá de Henares, Madrid, Spain. roman.andres@uah.es juanc.flores@uah.es.
authors.forename: Francisco
authors.initials: F
authors.lastname: Martínez-Olid
authors.forename: Román
authors.initials: R
authors.lastname: Andrés
authors.forename: Ernesto
authors.initials: E
authors.lastname: de Jesús
authors.forename: Juan C
authors.initials: JC
authors.lastname: Flores
authors.forename: Pilar
authors.initials: P
authors.lastname: Gómez-Sal
authors.forename: Karine
authors.initials: K
authors.lastname: Heuzé
authors.forename: Luc
authors.initials: L
authors.lastname: Vellutini