Abstract
Metallic complexes containing heavier tetrylene ligands have been known for more than 40 years; however, their applications in homogeneous catalysis have been little studied. This situation has changed recently, particularly since the appearance of new generations of these ligands. This article starts with a brief description of the general features of heavier tetrylenes and the development of their coordination chemistry and ends reviewing the current state of the art in the use of these ligands in homogeneous catalysis.