In this communication, we report the use of aqueous ammonia as original conditions for the metalation of imidazol(in)ium ligands. This reaction, performed in homogenous conditions via a soluble silver-ammine complex is a rapid, scalable and often efficient access to silver-NHC complexes. Moreover, modification of the reported reaction conditions allowed the preparation of unprecedented heteroleptic
Imidazol(in)ium-2-Carboxylates as Efficient Precursors to N-Heterocyclic Carbene Complexes of Copper and Silver
作者:Tomasz K. Olszewski、Dagmara E. Jaskólska
DOI:10.1002/hc.21056
日期:2012.11
Copper and silverN-heterocycliccarbene (NHC) complexes were prepared through a simple, base-free protocol involving the decomposition of corresponding imidazol(in)ium-2-carboxylates under thermolytic conditions and a subsequent reaction of the in situ generated carbenes with copper(I) or silver(I) chloride, respectively. The desired NHC metal complexes were isolated with good yields after simple