Abstract
Reductive elimination from square planar d8-organotranstion metal complexes of nickel (II), palladium (II) and gold (III) involving carbon-carbon bond formation has been considered as one of the most important fundamental steps in relation to various organic and catalytic reactions promoted by transition metal complexes. The mechanism for the reductive elimination varies depending on the metals, supporting ligands, oxidation states, structure of intermediate and etc. The stability of the intermediates are in the order of 3, 5 and 4-coordinate complexes. Carbon-carbon bond formation on the gold (III) is regio and stereo selective. Selectivity in the leaving organic group directly bonded to metals, strongly depends not only on the electronic factor, but also on the pπ charcter of the α-carbon.
