Synthesis and characterization of (pyrazolylethylphosphinite)nickel(II) complexes and catalytic activity towards ethylene oligomerization

Juliana M. Edor; Gershon Amenuvor; Collins Obuah; Alfred Muller; James Darkwa

doi:10.1002/aoc.4101

Synthesis and characterization of (pyrazolylethylphosphinite)nickel(II) complexes and catalytic activity towards ethylene oligomerization

Juliana M. Edor, Gershon Amenuvor, Collins Obuah, Alfred Muller, James Darkwa

Chemical Sciences

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

Compounds (2-(3,5-dimethyl-1H-pyrazol-1-yl)ethyldiphenylphosphinite (L1), 2-(3,5-di-tert-butyl-1H-pyrazol-1-yl)ethyldiphenylphosphinite (L2), and 2-(3,5-diphenyl-1H-pyrazol-1-yl)ethyldiphenylphosphinite (L3) were prepared using the synthetic routes reported in literature. These compounds were reacted with [NiCl₂(DME)₂] or [NiBr₂(DME)₂] under appropriate reaction conditions to afford six new nickel(II) compounds ([NiCl₂(L1)] (1), [NiCl₂(L2)] (2), [NiCl₂(L3)] (3), [NiBr₂(L1)] (4), [NiBr₂(L2)] (5) and [NiBr₂(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.

Original language	English
Article number	e4101
Journal	Applied Organometallic Chemistry
Volume	32
Issue number	2
DOIs	https://doi.org/10.1002/aoc.4101
Publication status	Published - Feb 2018

Keywords

ethylene
nickel complexes
oligomerization
pyrazolylphosphinite

ASJC Scopus subject areas

General Chemistry
Inorganic Chemistry

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title = "Synthesis and characterization of (pyrazolylethylphosphinite)nickel(II) complexes and catalytic activity towards ethylene oligomerization",

abstract = "Compounds (2-(3,5-dimethyl-1H-pyrazol-1-yl)ethyldiphenylphosphinite (L1), 2-(3,5-di-tert-butyl-1H-pyrazol-1-yl)ethyldiphenylphosphinite (L2), and 2-(3,5-diphenyl-1H-pyrazol-1-yl)ethyldiphenylphosphinite (L3) were prepared using the synthetic routes reported in literature. These compounds were reacted with [NiCl2(DME)2] or [NiBr2(DME)2] under appropriate reaction conditions to afford six new nickel(II) compounds ([NiCl2(L1)] (1), [NiCl2(L2)] (2), [NiCl2(L3)] (3), [NiBr2(L1)] (4), [NiBr2(L2)] (5) and [NiBr2(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.",

keywords = "ethylene, nickel complexes, oligomerization, pyrazolylphosphinite",

author = "Edor, {Juliana M.} and Gershon Amenuvor and Collins Obuah and Alfred Muller and James Darkwa",

note = "Publisher Copyright: Copyright {\textcopyright} 2017 John Wiley & Sons, Ltd.",

year = "2018",

month = feb,

doi = "10.1002/aoc.4101",

language = "English",

volume = "32",

journal = "Applied Organometallic Chemistry",

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AU - Edor, Juliana M.

AU - Amenuvor, Gershon

AU - Obuah, Collins

AU - Muller, Alfred

AU - Darkwa, James

PY - 2018/2

Y1 - 2018/2

N2 - Compounds (2-(3,5-dimethyl-1H-pyrazol-1-yl)ethyldiphenylphosphinite (L1), 2-(3,5-di-tert-butyl-1H-pyrazol-1-yl)ethyldiphenylphosphinite (L2), and 2-(3,5-diphenyl-1H-pyrazol-1-yl)ethyldiphenylphosphinite (L3) were prepared using the synthetic routes reported in literature. These compounds were reacted with [NiCl2(DME)2] or [NiBr2(DME)2] under appropriate reaction conditions to afford six new nickel(II) compounds ([NiCl2(L1)] (1), [NiCl2(L2)] (2), [NiCl2(L3)] (3), [NiBr2(L1)] (4), [NiBr2(L2)] (5) and [NiBr2(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.

AB - Compounds (2-(3,5-dimethyl-1H-pyrazol-1-yl)ethyldiphenylphosphinite (L1), 2-(3,5-di-tert-butyl-1H-pyrazol-1-yl)ethyldiphenylphosphinite (L2), and 2-(3,5-diphenyl-1H-pyrazol-1-yl)ethyldiphenylphosphinite (L3) were prepared using the synthetic routes reported in literature. These compounds were reacted with [NiCl2(DME)2] or [NiBr2(DME)2] under appropriate reaction conditions to afford six new nickel(II) compounds ([NiCl2(L1)] (1), [NiCl2(L2)] (2), [NiCl2(L3)] (3), [NiBr2(L1)] (4), [NiBr2(L2)] (5) and [NiBr2(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.

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KW - oligomerization

KW - pyrazolylphosphinite

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Synthesis and characterization of (pyrazolylethylphosphinite)nickel(II) complexes and catalytic activity towards ethylene oligomerization

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