“… In 2000, Herrmann and co-workers reported similar NHC–Pd 0 complexes . At the time, the fact that Ni 0 , Pd 0 , and Pt 0 complexes were isolated was not by itself remarkable; these metals had previously been isolated as complexes with other L-type ligandse.g., dibenzylideneacetone (dba), , CO, and PPh 3 . − However, these reports suggested that NHCs have the right combination of steric and electronic properties to complement these canonical ligands. Furthermore, the unique properties , and synthetic flexibility of NHCs hinted that maybe they could be used to isolate other elusive species.…”