Nickel Complexes Based on Tridentate Pyrazolyl Ligands for Highly Efficient Dimerization of Ethylene to 1-Butene

A series of new pentacoordinated nickel complexes NiCl2(NZN) based on nitrogen-, oxygen-, or sulfur-bridged bis(pyrazolyl) ligands (NZN) were synthesized and characterized by elemental analysis and an X-ray diffraction study for NiCl2{bis[2-(3,5-dimethylpyrazolyl)ethyl)]amine} (1). Upon activation w...

Full description

Saved in:
Bibliographic Details
Published in:Organometallics 2006-02, Vol.25 (5), p.1213-1216
Main Authors: Ajellal, Noureddine, Kuhn, Maria C. A, Boff, Andressa D. G, Hörner, Manfredo, Thomas, Christophe M, Carpentier, Jean-François, Casagrande, Osvaldo L
Format: Article
Language:English
Subjects:
Catalysis
Chemical Sciences
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A series of new pentacoordinated nickel complexes NiCl2(NZN) based on nitrogen-, oxygen-, or sulfur-bridged bis(pyrazolyl) ligands (NZN) were synthesized and characterized by elemental analysis and an X-ray diffraction study for NiCl2{bis[2-(3,5-dimethylpyrazolyl)ethyl)]amine} (1). Upon activation with methylaluminoxane (MAO), these complexes show high activity in ethylene oligomerization (TOF = 7−80 × 103 h-1), which varies according to the ligand environment. Up to 92% selectivity for 1-butene, combined with a TOF of 60 × 103 h-1, has been obtained under moderate conditions (30 °C, 40 bar, MAO-to-Ni = 250) using NiCl2{bis[2-(5-phenylpyrazolyl)ethyl)]ether} (3) as the catalyst precursor.
ISSN:0276-7333
1520-6041
DOI:10.1021/om050920w