Pyrazolylimine iron and cobalt, and pyrazolylamine nickel complexes: Synthesis and evaluation of nickel complexes as ethylene oligomerization catalysts

Ainooson, Michael K.; Guzei, Ilia A.; Spencer, Lara C.; Darkwa, James

doi:10.1016/j.poly.2013.01.018

Cited by 31 publications

(17 citation statements)

References 52 publications

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“…The reaction of NiCl 2 ⋅6H 2 O or CoCl 2 ⋅6H 2 O with L1-L4 in methanol at 40°C afforded the corresponding nickel complexes (1-4) and Cobalt complexes (5)(6)(7)(8), isolated as green and brown solids in moderate to good yields. The synthesized complexes were characterized by UV-Vis, IR spectra, ESI-MS and elemental analysis.…”

Section: Synthesis and Characterization Of Ligands And Complexesmentioning

confidence: 99%

“…[32][33][34][35] Scheme 1. Synthetic routes of ligands (L1-L4) and complexes (1)(2)(3)(4)(5)(6)(7)(8)…”

Section: Evaluation Of Metal Complexes As Catalysts For Ethylene Oligmentioning

confidence: 99%

“…[1][2][3][4] Moreover, the transition metals play an important role in ethylene oligomerization catalysts, which can produce a wide range of LAOs. [5][6][7][8] Continually considerable demand for these short chain oligomers has led to great interest in selective ethylene oligomerization technologies. [9] Among these transition metal catalysts, the nickel-based catalysts are the most well-known to produce 1-butene, such as the Shell High Olefin Process (SHOP) bearing a monoanionic P, O-chelate.…”

Section: Introductionmentioning

confidence: 99%

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Ethylene Oligomerization Study Bearing Nickel (II) and Cobalt (II) Complexes with N, O‐Donor Schiff Bases as Ligands

et al. 2019

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A series of novel nickel 1–4 {[Ni(L1)] (1); [Ni(L2)Cl2] (2); [Ni(L3)Cl2] (3); [Ni(L4)Cl2] (4)} and cobalt complexes 5–8 {[Co(L1)] (5); [Co(L2)Cl2] (6); [Co(L3)Cl2] (7); [Co(L4)Cl2] (8)}bearing N, O‐donor Schiff bases as ligands L1‐L4 (L1= (E)‐2‐(((2‐phenoxyethyl)imino)methyl)‐phenol; L2= (E)‐5‐methoxy‐2‐(((2‐phenoxyethyl)imino)methyl)phenol; L3= (E)‐2‐(((2‐(2‐methox yphenoxy)ethyl)imino)methyl)phenol; L4= (E)‐5‐methoxy‐2‐(((2‐(2‐methoxyphenoxy)ethyl)imino) methyl)phenol) were synthesized from the complex reaction between salicylaldehyde and phenoxye‐thylamine analogues and characterized by UV‐Vis, IR, 1H NMR, ESI‐MS and elemental analysis. All the nickel complexes (1‐4) and cobalt complexes (5‐8) as catalyst precursors were evaluated in detail with methylaluminoxane (MAO) as an activator in the ethylene oligomerization. At the same time, the effects of reaction parameters, catalyst structures and solvent on ethylene oligomerization were investigated too. As a result, complexes 5–8 showed a better catalytic activity (2.05‐3.38×105 g/(mol(Co)•h) and a higher selectivity of 34.44% toward the valuable C8 compound using toluene as the solvent than complexes 1–4.

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Section: Synthesis and Characterization Of Ligands And Complexesmentioning

confidence: 99%

“…[32][33][34][35] Scheme 1. Synthetic routes of ligands (L1-L4) and complexes (1)(2)(3)(4)(5)(6)(7)(8)…”

Section: Evaluation Of Metal Complexes As Catalysts For Ethylene Oligmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ethylene Oligomerization Study Bearing Nickel (II) and Cobalt (II) Complexes with N, O‐Donor Schiff Bases as Ligands

et al. 2019

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“…[13,14,15] Mannich base is a three-component condensation product of active hydrogen containing compound, an aldehyde and a secondary amine. The formation of product depends on the nucleophilicity of substrate and pH of the reaction medium.…”

Section: Introductionmentioning

confidence: 99%

Metal Complexes of N-[Morpholine-4-Yl-(4- Nitrophenyl)-Methyl]-Benzamide: Synthesis, Characterization and Evaluation of Pesticidal and Larvicidal Activity

Kannan¹

2017

WJPR

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“…[1][2][3] Ethylene oligomerization is one of the most significant technical route to synthesize a-Olefins and is currently receiving great interest both in academia and industry. [15][16][17] Especially in recent years, many nickel complexes with a novel ligand structure have been exploited. [6][7][8][9][10][11][12][13][14] At present, the typical nickel catalysts for ethylene oligomerization mainly consist of a-diimine nickel complexes, pyridine imine nickel complexes, salicylaldimine nickel complexes, Schiff base type nickel complexes, and imino imidazole complexes etc.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Ethylene Oligomerization of Hyperbranched Salicylaldimine Nickel Complexes

Wang

Zhang

et al. 2016

Adv Polym Technol

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A series of new hyperbranched salicylaldimine nickel complexes were synthesized by the Schiff's base and the complexation reactions with 1.0 generation hyperbranched macromolecules, salicyladehyde and nickel chloride hexahydrate as materials by employing two-step synthesis and one-pot synthesis, respectively. The hyperbranched salicylaldimine ligands and the complexes were characterized by FT-IR, 1 H NMR, UV, and ESI-MS. All nickel complexes, activated with Methylaluminoxane, exhibited high activities for ethylene oligomerization (TOF = 1.92-4.93 g/mol Ni h) and showed good selectivities for the longer chain oligomers produced (36.35-60.33%). When activated with ethylaluminum dichloride, it was found that a tandem process occurred in which ethylene oligomerization was followed by Friedel-Crafts alkylation of the reaction solvent, toluene. On increasing the pressure of ethylene and Al/Ni ratio, the catalytic activities of precatalyst increased and the processes became more selective for the shorter oligomers. Not only the polymerized parameters but also the length of alkyl chain of the ligands influenced the catalytic activities and selectivities for the longer chain oligomers. The catalytic activities and selectivities for the longer chain oligomers declined with the increase in length of alkyl chain of ligand.

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Pyrazolylimine iron and cobalt, and pyrazolylamine nickel complexes: Synthesis and evaluation of nickel complexes as ethylene oligomerization catalysts

Cited by 31 publications

References 52 publications

Ethylene Oligomerization Study Bearing Nickel (II) and Cobalt (II) Complexes with N, O‐Donor Schiff Bases as Ligands

Ethylene Oligomerization Study Bearing Nickel (II) and Cobalt (II) Complexes with N, O‐Donor Schiff Bases as Ligands

Metal Complexes of N-[Morpholine-4-Yl-(4- Nitrophenyl)-Methyl]-Benzamide: Synthesis, Characterization and Evaluation of Pesticidal and Larvicidal Activity

Synthesis and Ethylene Oligomerization of Hyperbranched Salicylaldimine Nickel Complexes

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