Rotamers of palladium complexes bearing IR active N-heterocyclic carbene ligands: Synthesis, structural characterization and catalytic activities

Coordination Chemistry of Highly Hemilabile Bidentate Sulfoxide N‐Heterocyclic Carbenes with Palladium(II)

“…The signals of anti configuration was shifted upfield, presumably as a result of the ring current of the Mes group. [19] The ratios for anti versus syn with respect to 4 a and 4 b are both estimated to be 1.1.…”

“…[6b, 18c] The NMR spectroscopy data show that the two rotamers are in a syn/anti ratio of 1:2.4 for trans-10 a, and 1.3:1 for trans-10 b. [19] No cross-peak between two NHC ligands in the NOESY spectra indicates the trans orientation of the NHCs. The carbene resonances in the Single crystals of trans-10 aA C H T U N G T R E N N U N G (anti) were obtained.…”

(η3-Allyl)bromido(1-phenyl-1H-imidazole-κN3)palladium(II)

“…For applications of allylpalladium(II) complexes in catalysis, see: Amatore et al (2005) ;Faller & Sarantopoulos (2004); Johannsen & Jørgensen (1998); Li et al (2006); Trost & Van Vranken (1996); Viciu et al (2002). For the crystal structure of a 1-phenyl-1H-imidazole derivative, see: Huynh & Wu (2009).…”

“…In the crystal structure, each palladium atom is coordinated to one allyl group (in η 3 mode), one bromine anion and a 1phenyl-1H-imidazole group, the bond lengths and angles have normal values (Huynh & Wu, 2009). Intramolecular faceto-face π-stacking interactions exist between adjacent phenyl or imidazolene groups, with centroid-centroid distances of 3.877 (1)-3.6596 (6) Å, forming a supramolecular chain along the [100] direction.…”

Application of dimeric orthopalladate complex of homoveratrylamine as an efficient catalyst in the Heck cross-coupling reaction

“…However, the cost and sensitivity of phosphines to air and moisture resulted in development of new catalytic systems such as palladium complexes bearing N-heterocyclic carbene ligands [38] or nitrogen-donor ligands [39]. For several years only aryl iodides and aryl bromides were employed in the Heck reaction.…”