Transition-Metal-Catalyzed Reactions Involving Imidazolium Salt/N-Heterocyclic Carbene Couples as Substrates

摘要

In previous studies we demonstrated that hydrocarbyl-M-carbene complexes (M=Group 10 metal) readily undergo reductive elimination to give M~0 and C2-substituted imida-zolium salts (Scheme 1,Equation (1)).As this presents a potential impediment for the use of N-heterocyclic carbene (NHC) complexes in catalysis,we investigated methods for controlling or restricting the reaction.