Novel nickel complexes with hyperbranched structure: Synthesis, characterization and performance in ethylene oligomerization

Li, Cuiqin; Wang, Fengfeng; Lin, Zhiyu; Zhang, Na; Wang, Jun

doi:10.1016/j.ica.2016.08.049

Cited by 10 publications

(10 citation statements)

References 30 publications

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“…Increasing the carbon chain length in both positions (n and R) leads to less soluble pre-catalysts, and thus decreases the rate of oligomerization (49a-c). [134][135][136] Replacing the linear alkyl R 49c with a cyclic alkyl 49d induces higher activity of the catalytic system without changing the selectivity (Table 6, example for 49d). 137 Bidentate phenoxide-iminophosphorane nickel(II) complexes 50 and 51 (Figure 27 The complexes 50 and 51 were evaluated and compared for the catalytic oligomerization of ethylene in the presence of AlEt 2 Cl.…”

Section: Figure 26 Salicylaldimine-based Nickel(ii) Complexesmentioning

confidence: 99%

“…Wang et al − developed hyperbranched salicylaldimine nickel complex 49 (Figure ) with the intention of combining the best properties of homogeneous and heterogeneous catalyst. The choice of the cocatalyst has a great impact on the selectivity of the catalytic system.…”

Section: Ligand Design Approach For Homogeneous Ethylene Oligomerizat...mentioning

confidence: 99%

“…In the presence of MAO, the complexes 49 exhibit good activity and a Schulz–Flory distribution with low selectivity for butenes, whereas in the presence of Et 3 Al, high selectivities for butenes are observed. Increasing the carbon chain length in both positions (n and R) leads to less soluble precatalysts, and thus decreases the rate of oligomerization ( 49a – c ). − Replacing the linear alkyl R 49c with a cyclic alkyl 49d induces higher activity of the catalytic system without changing the selectivity (Table , example for 49d ) …”

Section: Ligand Design Approach For Homogeneous Ethylene Oligomerizat...mentioning

confidence: 99%

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Nickel Catalyzed Olefin Oligomerization and Dimerization

et al. 2020

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Brought to life more than half a century ago and successfully applied for high-value petrochemical intermediates production, nickel-catalyzed olefin oligomerization is still a very dynamic topic, with many fundamental questions to address and industrial challenges to overcome. The unique and versatile reactivity of nickel enables the oligomerization of ethylene, propylene and butenes into a wide range of oligomers that are highly sought-after in numerous fields to be controlled. Interestingly, both homogeneous and heterogeneous nickel catalysts have been scrutinized and employed to do this. This rare specificity encouraged us to interlink them in this review so as to open up opportunities for further catalyst development and innovation. An in-depth understanding of the reaction mechanisms in play is essential to being able to fine-tune the selectivity and achieve efficiency in the rational design of novel catalytic systems. This review thus provides a complete overview of the subject, compiling the main fundamental/industrial milestones and remaining challenges facing homogeneous/heterogeneous approaches as well as emerging catalytic concepts, with a focus on the last 10 years.

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Section: Figure 26 Salicylaldimine-based Nickel(ii) Complexesmentioning

confidence: 99%

Section: Ligand Design Approach For Homogeneous Ethylene Oligomerizat...mentioning

confidence: 99%

Section: Ligand Design Approach For Homogeneous Ethylene Oligomerizat...mentioning

confidence: 99%

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Nickel Catalyzed Olefin Oligomerization and Dimerization

et al. 2020

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“…In terms of the product distributions, we found that the complex showed good selectivity toward 1-butene. A possible explanation for this phenomenon was because increasing the Al/Ni molar ratio might make the rate of chain growth decrease and the β-hydride elimination correspondingly increase [26]. The effects of reaction temperature on the catalytic performance of the PD-complex in ethylene oligomerization under the conditions of 0.5 h, 0.5 MPa and Al/Ni molar ratio of 700 are shown in Fig.…”

Section: Influence Of Reaction Conditions On Ethylene Oligomerizationmentioning

confidence: 98%

“…The compound (KCl) obtained by the reaction of K 2 CO 3 and HCl formed in the synthesis of PD-(NHOC) 6 , the unreacted K 2 CO 3 and the excess 4-acetamidophenol were removed by washing the product with 60 °C hot water. Nickel chloride hexahydrate was used in excess and the reaction was carried out at the reflux of ethanol, which was higher than the reaction temperature of the nickel complexes in our previous works [26]. The yields and the values of the melting point for PD-(NHOC) 6 and PD-(NH 2 ) 6 were listed in the experimental section, and the Ni content and the ESI-MS value for the PD-complex were also listed in the experimental section.…”

Section: Synthesis and Characterizationmentioning

confidence: 99%

Synthesis and ethylene oligomerization behavior of trinuclear nickel complex with phosphorus dendrimer

et al. 2021

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A phosphorus dendrimer with multiple amino groups was synthesized via a two-step reaction with phosphonitrilic chloride trimer and 4-acetamidophenol. The trinuclear nickel complex was subsequently prepared with the phosphorus dendrimer and nickel chloride hexahydrate as starting materials. The structures of the phosphorus dendrimer and the trinuclear nickel complex were characterized by physicochemical and spectroscopic methods. The trinuclear nickel complex based on the phosphorus dendrimer was evaluated as catalyst precursor for ethylene oligomerization using methylaluminoxane (MAO) as an activator. Under the conditions of 0.5 h, 0.9 MPa, 25 °C and Al/Ni molar ratio of 700, the catalytic activity of the trinuclear nickel complex showed a maximum value of 2.31 × 10 5 g/(mol Ni h), and the oligomerization products were mainly low-carbon olefins (C 4 and C 6 ). The ligand structure and the coordination mode showed notable variations in the catalytic activities and the product distribution due to the influence of electronic and steric effects. The catalytic activity of the nickel complex based on the ligand with an aryl backbone was superior to the nickel complex based on the ligand with an alkyl backbone.

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Effect of Ligand Structure on Ethylene Oligomerization over Salicylaldehyde Imine Nickel Complexes: Experiments and Calculations

Chen,

Tan,

Lan

et al. 2023

Applied Organom Chemis

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Salicylaldehyde imine nickel complexes Ni1‐Ni10 containing different electron‐donating and electron‐withdrawing groups on benzene rings were synthesized, using ethylenediamine, salicylaldehyde derivatives with different substituents and nickel chloride hexahydrate as raw materials. Structure characterization, such as elemental analysis, Fourier transform infrared (FT‐IR), nuclear magnetic resonance (NMR), ultraviolet–visible (UV–Vis), and electrospray ionization mass spectrometry (ESI‐MS), confirmed that the structure of synthesized complexes was consistent with the theoretical. Salicylaldehyde imine nickel complexes exhibited good catalytic activity in ethylene oligomerization process, and complexes containing electron‐donating groups on the benzene ring had higher catalytic activity than complexes containing electron‐withdrawing groups on the benzene ring. With the increase of steric hindrance of phenol hydroxyl ortho‐substituents, the catalytic activity decreased, as well as the catalytic selectivity toward olefins with higher carbon number. The relationship between structure and catalytic properties was further studied by density functional theory (DFT) calculations, and the possible mechanism of nickel complexes catalyzing ethylene oligomerization was proposed.

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Novel nickel complexes with hyperbranched structure: Synthesis, characterization and performance in ethylene oligomerization

Cited by 10 publications

References 30 publications

Nickel Catalyzed Olefin Oligomerization and Dimerization

Nickel Catalyzed Olefin Oligomerization and Dimerization

Synthesis and ethylene oligomerization behavior of trinuclear nickel complex with phosphorus dendrimer

Effect of Ligand Structure on Ethylene Oligomerization over Salicylaldehyde Imine Nickel Complexes: Experiments and Calculations

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