Carbocyclic Carbene Metal Complexes

A number of researchers highlighted research efforts to synthesize cabocyclic carbene metal complexes in the special issue of Chemical Reviews. They informed that dimeric cyclopropenylidene complexes of metals were rapidly accessible through the oxidative addition of geminal dihalocyclopropenes to metals, such as palladium and platinum. A team of researchers described the reaction of diaminocyclopropenium perchlorates with mercury acetate that yielded the corresponding diaminocyclopropenylidene mercury complexes. Some other researchers expanded their investigations into the utility of the free carbene for synthetic strategies based on ligand association and displacement reactions with metal complexes bearing labile ligand to yield novel cyclopropenylidene complexes. Another team of researchers was able to prepare ruthenium cyclopropenylidene complexes through cylization of vinylidene ligands.