The type of ligand and position, are some of the key factors for changing the catalyst performance, i.e. selectivity. In the publication, a number of organometallic complexes were tested for trimerization and tetramerization of ethylene. With this information, build diagrams where you can show the difference between the catalysts, and answer the following questions: - Is there a better catalyst for trimerization? - Is there a better catalyst for tetramerization? - What about the ligands? - What about the activity of the catalysts? *Paper: Ethylene tetramerization: Subtle effects exhibited by N-substituted diphosphinoamine ligands