Elongation and branching of α-olefins by ethylene employing an easily accessible Zr catalyst

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Heber, Christian ; Dietel, Thomas ; Haas, Isabelle ; Kretschmer, Winfried ; Kempe, Rhett:
Elongation and branching of α-olefins by ethylene employing an easily accessible Zr catalyst.
In: Journal of Catalysis. Bd. 434 (2024) . - 115503.
ISSN 0021-9517
DOI: https://doi.org/10.1016/j.jcat.2024.115503

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Abstract

Selective co-oligomerizations between α-olefins and ethylene are of high interest since they allow to extend the α-olefin scope employing inexpensive and abundantly available ethylene. Here we report on an easily accessible zirconium catalyst that permits the co-oligomerization of 1-hexene and ethylene with an activity of 2200 kg/mol h bar and a co-oligomer selectivity of 65 mol. In more detail, we report synthesis and structure of six novel Zr precatalysts, their ethylene homo-oligomerization behavior and the co-oligomerization of the most promising of the six precatalysts. Criteria were activity and selectivity (α-value). Some of the Zr catalyst systems introduced here show an extremely high activity in ethylene homo-oligomerization up to 96,600 kg/mol h bar.