This topic is aimed at basic research on comlpexes of early transition metals having a close relationship to applied research of catalysts for polymerization and oligomerization of olefins. The development of new ligands or their transformations has been proved to be a powerful synthetic tool allowing obtaining structurally new products. We plan to prepare novel types of frustrated Lewis pairs based on complexes of group 3 and 4 elements and to study their properties. Reactivity of these systems will be investigated particularly with respect to their ability to activate bonds in small molecules. The basic research will continue in the field of synthesis of novel catalysts based on rare-earth metals and lanthanides and their applications in selective C-C bond formation and C-H/C-X (X -another element) bond activation reactions. In line with previous results the design, preparation and study of new aluminium free ternary olefin polymerization catalyst systems will be implemented. These systems will be based on cationic group 4 metallocene hydride species. The main benefits will be greatly reduced cost, polymers without aluminium contamination and safer polymerization process conditions.