Abstract
A series of aminophosphine ligands were synthesized by in situ combination of CrCl3(THF)3 and dry methylaluminoxane and examined for their catalytic behavior in chromium-catalyzed selective ethylene oligomerization. Variations of the ligand scaffold obtained by modifying the diarylphosphine moiety affected the steric bulkiness, which resulted in remarkable changes in the selectivity for 1-hexene vs. 1-octene. Based on our experimental results, we evaluated two different mechanisms proposed for selective ethylene oligomerization.
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