N-Heterocyclic carbenes

Heterocyclic Carbenes: Synthesis and Coordination Chemistry

“…[301] Complexes of the type [M(NHC) 2 ] (M = Pd, Pt) are coordinatively and electronically unsaturated (14-electron complexes). Their properties were studied using DFT calculations.…”

Use of bis(benzimidazolium)–palladium system as a convenient catalyst for Heck and Suzuki coupling reactions of aryl bromides and chlorides

“…These studies revealed the crucial role played by the ancillary ligands in the efficiency of these reactions. Sterically hindered, electron-rich alkyl phosphines 17 and carbene 18 ligands have received increasing interest in recent years. However, the phosphine ligands and the phosphine-palladium complexes are labile to air and moisture at high temperatures, placing significant limits on their synthetic utility.…”

Sterically induced differences in N-heterocyclic carbene transition metal complexes

“…The same structural features are observed in the cationic homoleptic group 11 complexes [M(NHC) 2 ]X (X = anion) [44][45][46][47]. It is perhaps inter- esting to note that the corresponding phosphane complexes feature three or four ligands compared to the two ligands in the case of the carbene complexes [48] highlighting the different steric shielding properties of the two ligand families.…”