Thioether-Functionalized N-Heterocyclic Carbenes: Mono- and Bis-(<i>S</i>,<i>C</i><sub>NHC</sub>) Palladium Complexes, Catalytic C−C Coupling, and Characterization of a Unique Ag<sub>4</sub>I<sub>4</sub>(<i>S</i>,<i>C</i><sub>NHC</sub>)<sub>2</sub> Planar Cluster
作者:Christophe Fliedel、Pierre Braunstein
DOI:10.1021/om100500y
日期:2010.11.8
The corresponding Ag(I) NHC complexes 1·AgX−8·AgX were synthesized and fully characterized. An unprecedented planar, centrosymmetric cluster, [Ag4(μ3-I)2(μ2-I)2(μ2-S,CNHC)2] [5·(AgI)2]2, was obtained in which two functional carbene ligands bridge two edges of a silver rectangle. With the N-alkyl-N′-thioether ligands, [PdCl2(S,CNHC)2] complexes were prepared by two different routes: the usual transmetalation