Chromium Ethylene Tri-/Tetramerization Catalysts Supported by Iminophosphine Ligands.

ABSTRACT: A new class of highly active ethylene tri-/tetramerization chromium catalysts supported by iminophosphine ligands has been studied. The impact of electronic and steric changes of these ligands on selectivity and activity has been investigated by varying P- and/or N-substituents. Upon activation with MMAO, the ligand bearing a P-cyclohexyl group displayed a high activity of 307 kg/(g Cr/h) with a high trimerization selectivity of 92.6%. Decreasing the steric hindrance of N-aryl group led to a decrease in 1-hexene selectivity (74.5%), producing more 1-octene (10.3%). X-ray diffraction analysis verifies that the ligands coordinate with the chromium center in a κ²-P,N mode.

SUBMITTER: Zhao X 

PROVIDER: S-EPMC10536060 | biostudies-literature | 2023 Sep

REPOSITORIES: biostudies-literature