This article is devoted to the use of some concepts of organometallic chemistry for their application in homogeneous catalysis developed in our laboratory in Lille and presented in the Gecom-Concoord meeting in Albe ´. The first examples will deal with the use of bifunctional ligands, where it will be shown that designing an aminophosphine ligand allows one to improve the rate of linear dimerization of dienic substrates by two orders of magnitude, as compared with the same reaction conducted in protic media. Another application will concern the use of the hemilability character of a suitable methoxy substituted, sterically hindered alcoxy ligand, responsible for the original metathesis reaction of terminal acetylenes. The second part will be devoted to the use of transmetalation reactions, at first in polymerization reactions, where the concept of Coordinative Catalyzed Chain Growth Transfer will be established using Lanthanide complexes and magnesium dialkyls, applied to olefins, conjugated dienes, styrene and isoprene/styrene statistical copolymerization. The last topic will develop carbonylation reactions using boronic acids and enones or alkynes, in which the key step is a transmetalation/carbonylation sequence, opening the way to new catalytic carbonylation processes.