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Recyclable Pd(0)-Pd(II) composites formed from Pd(II) dimers with NHC ligands under Suzuki-Miyaura conditions.
Autorzy
Rok wydania
2015
Czasopismo
Journal of Organometallic Chemistry
Numer woluminu
785
Strony
92-99
DOI
10.1016/j.jorganchem.2015.03.009
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
Dimeric complexes of the type [Pd(μ-X)X(NHC)]2 were employed in the Suzuki–Miyaura cross-coupling leading to 2-methylbiphenyl. The excellent activity of the studied dimers is perfectly illustrated by a TOF of up to 106 h−1. Mechanistic investigations with the application of TEM, XPS, and mercury poisoning tests provided an insight into the nature of the catalytic process. Accordingly, the reduction of the dimeric palladium complex [Pd(μ-X)X(NHC)]2 resulted in the formation of a composite containing Pd(0) nanoparticles protected by a layer of a Pd(II) species such as anions [PdBr4]2− or [PdBr3(NHC)]−. The in situ formation of Pd(0)–Pd(II) composites resulted in the high stability of the catalytic system, which was active in ten subsequent recycles without any additional protection.
Słowa kluczowe
nanoparticles, N-heterocyclic carbene, palladium, Suzuki-Miyaura reaction
Adres publiczny
http://dx.doi.org/10.1016/j.jorganchem.2015.03.009
Strona internetowa wydawcy
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