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Synthesis and characterization of (pyrazolylethylphosphinite)nickel(II) complexes and catalytic activity towards ethylene oligomerization
Author(s) -
Edor Juliana M.,
Amenuvor Gershon,
Obuah Collins,
Muller Alfred,
Darkwa James
Publication year - 2018
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.4101
Subject(s) - chemistry , catalysis , ethylene , nickel , toluene , alkylation , organic chemistry , medicinal chemistry , polymer chemistry , nuclear chemistry
Compounds (2‐(3,5‐dimethyl‐1 H ‐pyrazol‐1‐yl)ethyldiphenylphosphinite ( L1 ), 2‐(3,5‐di‐tert‐butyl‐1 H ‐pyrazol‐1‐yl)ethyldiphenylphosphinite ( L2 ) , and 2‐(3,5‐diphenyl‐1 H ‐pyrazol‐1‐yl)ethyldiphenylphosphinite ( L3 ) were prepared using the synthetic routes reported in literature. These compounds were reacted with [NiCl 2 (DME) 2 ] or [NiBr 2 (DME) 2 ] under appropriate reaction conditions to afford six new nickel(II) compounds ([NiCl 2 ( L1)] ( 1 ), [NiCl 2 ( L2 )] ( 2 ), [NiCl 2 ( L3 )] ( 3 ), [NiBr 2 ( L1 )] ( 4 ), [NiBr 2 ( L2 )] ( 5 ) and [NiBr 2 ( L3 )] ( 6 )). The new nickel(II) pre‐catalysts catalyze the oligomerization of ethylene, in the presence of ethylaluminium dichloride as co‐catalyst, to produce butenes, hexenes, octenes and higher carbon chain ethylene oligomers with very little Friedel‐Crafts alkylation products when the reactions were run in toluene.