Chelating and ‘pincer’ dicarbene complexes of palladium; synthesis and structural studiesElectronic supplementary information (ESI) available: crystallographic data and ORTEP plot for compound 5c. See http://www.rsc.org/suppdata/dt/b2/b209739g/

Synthesis and Characterisation of Mono‐ and Bidentate Alkoxybenzimidazolin‐2‐ylidene Palladium Complexes: Interesting Solution Behaviour and Application in Catalysis

“…In 7, the NHC units are disposed mutually trans around the palladium atom (Figure 10), which has been reported previously (12 [9] and 13 [24] ) for some o-xylyene-linked bis(NHC)-Pd II complexes having intramolecular steric in-teractions. While steric interactions between the xylyene ring and the 4,7-butoxy groups force the trans geometry in 12, both 7 and 13 adopt the trans geometry due to the bulk of the N-substituents, which prevent the NHCs adopting a mutually cis coordination at the palladium atom.…”

“…Selected bond lengths and angles for 7, 12 [9] and 13. [24] For 7 and 12, X = Br, for 13 X = Cl. ure 5), one with its methine proton oriented towards the Ag centre, the other with the two phenyl groups oriented towards the Ag centre.…”

Furan- and thiophene-functionalised bis-carbene ligands: Synthesis, silver(I) complexes, and catalysis

“…The furan-and thiophene-functionalised bis-imidazolium salts, together with the previously reported pyridinefunctionalised analogues [5,7,23], were applied in conjunction with Pd(dba) 2 and KO t Bu to the aryl amination of morpholine with 4-bromotoluene, Scheme 5. The results of these catalytic trials are given in Table 3, benchmarked against the highly active 1,3-bis(dipp)imidazolium chloride [24].…”

“…The concept of two NHC groups separated by a weaker donor ligand has been explored by several groups; most interest has focused on the incorporation of pyridine functionalities [5][6][7] with the structural characterisation of several Ag(I) complexes of R CNC (I) and R CNC 0 (II) (R = various alkyl/aryl) ligands reported, e.g., III [5]. More recently, Ag(I) complexes of more flexible bis-NHC ligands bearing linkages incorporating amino/amido [8], and ether [9] functionalities have been reported, the latter structurally characterised and found to be dinuclear [10], as well as ligands with chiral linker groups [11].…”

Palladium, rhodium and platinum complexes of ortho-xylyl-linked bis-N-heterocyclic carbenes: Synthesis, structure and catalytic activity

“…An approach that we have adopted in this work is to explore the use of ligands containing two NHCs linked by only one ortho-xylyl group (e.g. 2), a structural motif that in most cases binds metal centres in the same rigid cis-bis(NHC) mononuclear arrangement as analogous motifs containing two ortho-xylyl linkers [9,12,13]. The Pd(II) complex 2 and related Rh(I) and Ir(III) complexes have exhibited catalytic activity in a number of reactions [9,12].…”