New Procedures for Catalytic Carbophilic Activation by Gold and Gallium π‐Acids

摘要: Cationic gold(I) complexes are soft Lewis acids that able to trigger numerous types of nucleophilic attack onto alkenes, allenes, and alkynes (π-acid catalysis). In this account, we initially summarize the novel methods have developed generate such catalysts by silver-free activation ligated chlorides. The advantages approach use lower quantities gold ability scale-up transformations during which standard gold/silver catalytic system is rapidly decomposed. second part, synthesis activity original organogallium compounds described. We shown (NHC)GaCl2 +-type display a high affinity for alkenes alkynes, tandem C–C/C–C or C–C/C–H bond formation processes. Thus, they also behave as π-acids. Practical applications these different gold- gallium-based systems cyclic presented. 1 Introduction 2 Silver-Free Two-Component Approaches in Gold Catalysis 2.1 The Gold/Copper Catalytic System 2.2 Other Applications with Gold/Lewis Acid Systems 3 Gallium 3.1 Cationic Gallium Complexes Supported N-Heterocyclic Car­bene Ligands 3.2 Catalytic 4 Conclusions