163893-70-7

Upstream product

• 28923-39-9 nickel(II) bromide dimethoxyethane 
• 99819-59-7 3,8-dimethoxyacenaphthenequinone 
• 24544-04-5 2,6-diisopropylbenzenamine 
• 82-86-0 acenaphthene quinone 
• 187605-59-0 (2E)-2-[(2,6-diisopropylphenyl)imino]acenaphthylen-1(2H)-one 
• 13462-88-9 nickel dibromide 
• 153625-67-3 1,2-bis-[(2,6-diisopropylphenyl)imino]acenaphthene 

Downstream Products

• 603956-38-3 [2,6-iPr2C6H3-BIAN]Ni(η3-C4H7) 
• 510775-73-2 (C₁₀H₆C₂(NC₆H₃(CH(CH₃)2)2)2)Ni(CH₂CH₃)2 
• 510775-71-0 (C₁₀H₆C₂(NC₆H₃(CH(CH₃)2)2)2)Ni(CH₂CH₂CH₃)2 
• 244241-43-8 [C₃₆H₄₀N₂Ni(CH₃)2] 

Relevant academic research and scientific papers

One-Electron Reduction of Acenaphthene-1,2-Diimine Nickel(II) Complexes

New nickel-based complexes of 1,2-bis[(2,6-diisopropylphenyl)imino]acenaphthene (dpp-bian) with BF4 ? counterion or halide co-ligands were synthesized in THF and MeCN. The nickel(I) complexes were obtained by using two approaches: 1) electrochemical reduction of the corresponding nickel(II) precursors; and 2) a chemical comproportionation reaction. The structural features and redox properties of these complexes were investigated by using single-crystal X-ray diffraction (XRD), cyclic voltammetry (CV), and electron paramagnetic resonance (EPR) and UV/Vis spectroscopy. The influence of temperature and solvent on the structure of the nickel(I) complexes was studied in detail, and an uncommon reversible solvent-induced monomer/dimer transformation was observed. In the case of the fluoride complex, the unpaired electron was found to be localized on the dpp-bian ligand, whereas all of the other nickel complexes contained neutral dpp-bian moieties.

α-Diimine transition-metal complexes: Mechanochemistry - A new synthetic approach Dedicated to Professor Maria Jose? Calhorda on the occasion of her 65th birthday.

Preliminary results on the preparation of nickel(II) and cobalt(II) complexes containing α-diimine ligands using a mechanochemical approach are presented. The solvent-free reaction of [NiBr2(DME)] (DME = 1,2-dimethoxyethane) with the appropriate α-diimine ligand led to the formation of the expected Ni(II) complexes in very short reaction times and with quantitative yields. The same compounds were also successfully synthesised when NiBr2 was employed. This methodology was extended to the preparation of [Co(α-diimine)Cl2] complexes through the reaction of CoCl2 with different α-diimine ligands. These compounds were characterised by XRPD and SCXRD, when possible. The results obtained confirm that mechanochemistry has an enormous potential and that is an effective technique for the synthesis of coordination and organometallic compounds.

COMPOUND, COMPLEX, PREPARATION METHOD THEREOF, AND USE THEREOF

The present disclosure provides a compound, a complex, a preparation method thereof, and a use thereof. The compound is represented by the following structural formula, in which R1 to R10 are the same or different and are each independently selected from hydrogen, a hydrocarbon group having a carbon number of C1 to C16, a substituted hydrocarbon group, an alkoxy group, an alkylthio group, an alkylamino group, a haloalkylthio group, a halogen-substituted alkoxy group, a halogen-substituted alkylamino group, an aryloxy group, an arylthio group, arylamino group, a diphenylphosphino group, a halogen group, a nitro group, or a nitrile group. The complex of one embodiment of the present disclosure has a high catalytic effect, and can be used to prepare a highly branched, controllable, low molecular weight polymer with a high activity.

Simple and Strong Dative Attachment of α-Diimine Nickel (II) Catalysts on Supports for Ethylene Polymerization with Controlled Morphology

Abstract: In this article, preparation of novel spherical MgCl2 supported α-diimine nickel (II) catalysts for ethylene polymerization in slurry phase is reported. α-Diimine ligands were synthesized by condensation reaction of 2, 6-disubstituted alkyls or aryls anilines and Ace naphthoquinone Which have hydroxyl functionality in their para-position. Hydroxyl functionalized α-diimine attached strongly on to the spherical MgCl2 support surface by dative bonding. No linker was needed to attach the complexes onto the support surface and the amount of loaded Nickel was controllable to improve morphology and especially bulk density of polymer powder. A significant reduction in catalysts activity has happened when homogeneous catalysts were supported onto silica but this reduction was decreased when they were supported onto thermally treated spherical MgCl2. As homogeneous bis(N,N′-(4-(3-hydroxyl-propyl)-2,6-di[(4-tert-butyl-phenyl)-phenyl) amino] Ace naphthoquinone Nickel dibromide(d) showed the highest activity among other evaluated homogeneous catalysts, its MgCl2 supported catalyst (d/S-MgCl2) has shown the highest activity among MgCl2 supported catalysts too. These MgCl2 supported catalysts were pre-polymerized in presence of ethylene monomer in the mild polymerization condition to yield a pre-polymerized catalyst with polymer/catalyst weight ratio equal to six. Ethylene polymerization was carried out to make spherical particles of polyethylene without reactor fouling by these pre-polymerized catalysts. Clearly, it is shown in SEM images that the spherical morphology of MgCl2 support is replicated in the produced polymer. The molecular weight and molecular weight distribution of produced polymer with MgCl2 supported catalysts were higher than those produced by homogeneous catalysts. Graphic Abstract: α–Diimine nickel (II) complexes have hydroxy functionality where produce strong dative bonding onto spherical MgCl2. This bonding is strong enough that these catalysts are suitable for slurry polymerization of ethylene without reactor fouling due to catalyst leaching from support. The chemical structure of MgCl2 leads to high active supported catalysts. The molecular weight and polydispersity index of produced polymrers using these supported catalysts are higher than those produced by equivalent homogeneous catalysts and are controllable by selection of appropriate ligand for used α–diimine nickel (II) complex or hydrogen concentration in ethylene polymerization.[Figure not available: see fulltext.].

Mono- and binuclear nickel catalysts for 1-hexene polymerization

Polymerization of 1-hexene was carried out using a mononuclear (MN) catalyst and two binuclear (BN1 and BN2) α-diimine Ni-based catalysts synthesized under controlled conditions. Ethylaluminium sesquichloride (EASC) was used as an ef

Chain-Walking Polymerization of Linear Internal Octenes Catalyzed by α-Diimine Nickel Complexes

The chain-walking polymerization of linear internal alkenes (i.e., trans-2-, 3-, and 4-octenes) using α-diimine nickel catalysts activated with modified methylaluminoxane (MMAO) was studied in comparison with the corresponding terminal alkene polymerization. The rates of polymerization were found to decrease in the following order: 1-octene > 4-octene ≥ 2-octene ≥ 3-octene. The obtained branched poly(2-octene)s and poly(4-octene)s with high molecular weight and Mw/Mn less than 2 were amorphous polymers with low glass transition temperature (Tg) of approximately -66 °C. At 0 °C, 4-octene polymerized in a living/controlled manner. The NMR analyses of the polymers showed that the chain-walking polymerization of 4-octene gave periodically branched polymers with the constant branching density, while that of 2-octene gave the polymer possessing fewer branches than the expected value due to monomer-isomerization. The (n+2),(n+3)- and (n+3),(n+2)-insertions of the internal (n+2)-alkene [CH3(CH2)nCH=CH(CH2)mCH3] followed by chain-walking were confirmed by the 13C NMR analysis of the produced polymers.

Novel phenolic antioxidant-functionalized dendritic polyethylene: Synthesis by tailor-made nickel(II) α-diimine-catalyzed copolymerization and its characteristics as non-releasing additive

This work describes a simple one-pot and controlled synthetic method to generate migration-resistant bio-friendly tailor-made antioxidants through ethylene–sterically hindered phenolic antioxidant (SHPA) copolymerization by coordination polymerization usi

Nickel-Catalyzed Copolymerization of Ethylene and Vinyltrialkoxysilanes: Catalytic Production of Cross-Linkable Polyethylene and Elucidation of the Chain-Growth Mechanism

Copolymerizations of ethylene with vinyltrialkoxysilanes using cationic (α-diimine)Ni(Me)(CH3CN)+ complexes 4a,b/B(C6F5)3 yield high molecular weight copolymers exhibiting highly branched to nearly linear backbones depending on reaction conditions and catalyst choice. Polymerizations are first-order in ethylene pressure and inverse-order in silane concentration. Microstructural analysis of the copolymers reveals both in-chain and chain-end incorporation of -Si(OR)3 groups whose ratios depend on temperature and ethylene pressure. Detailed low-temperature NMR spectroscopic investigations show that well-defined complex 3b (α-diimine)Ni(Me)(OEt2)+ reacts rapidly at -60 °C with vinyltrialkoxysilanes via both 2,1 and 1,2 insertion pathways to yield 4- and 5-membered chelates, respectively. Such chelates are the major catalyst resting states but are in rapid equilibrium with ethylene-opened chelates, (α-diimine)Ni(R)(C2H4)+ complexes, the species responsible for chain growth. Chelate rearrangement via β-silyl elimination accounts for formation of chain-end -Si(OR)3 groups and constitutes a chain-transfer mechanism. Chelate formation and coordination of the Ni center to the ether moiety, R-O-Si, of the vinylsilane somewhat decreases the turnover frequency (TOF) relative to ethylene homopolymerization, but still remarkably high TOFs of up to 4.5 × 105 h-1 and overall productivities can be achieved. Activation of readily available (α-diimine)NiBr2 complexes 2 with a combination of AlMe3/B(C6F5)3/[Ph3C][B(C6F5)4] yields a highly active and productive catalyst system for the convenient synthesis of the copolymer, a cross-linkable PE. For example, copolymers containing 0.23 mol % silane can be generated at 60 °C, 600 psig ethylene over 4 h with a productivity of 560 kg copolymer/g Ni. This method offers an alternative route to these materials, normally prepared via radical routes, which are precursors to the commercial cross-linked polyethylene, PEX-b.

Influence of Backbone Substituents on the Ethylene (Co)polymerization Properties of α-diimine Pd(II) and Ni(II) Catalysts

A series of α-diimine ligands with different substituents on the acenaphthyl backbone were synthesized and characterized. The corresponding Ni(II) and Pd(II) complexes were prepared and used in ethylene polymerization and copolymerization with methyl acrylate. In ethylene polymerization, these Ni(II) complexes showed activities of up to 1.6 × 107 g/((mol of Ni) h), generating polyethylene with a molecular weight (Mn) of up to 4.2 × 105. Interestingly, these Ni(II) complexes behave very similarly in ethylene polymerization except for the complex with two methoxy substituents on the ortho position of the acenaphthyl backbone, in which case about 3 times higher polyethylene molecular weight and much lower branching density were observed. The ligand substituent effect is much more dramatic for the Pd(II) complexes. In ethylene polymerization, activities of up to 1.7 × 105 g/((mol of Pd) h) and a polyethylene molecular weight (Mn) of up to 4.7 × 104 could be obtained. The Pd(II) complex with two methoxy substituents on the ortho position of the acenaphthyl backbone demonstrated much higher activity and generated polyethylene with about 3 times higher molecular weight than that for the classic Pd(II) complex. A similar trend was maintained in ethylene-methyl acrylate copolymerization.

CATALYTIC SYSTEM FOR PREPARATION OF HIGH BRANCHED ALKANE FROM OLEFINS

The present invention discloses a catalytic system for preparing highly branched alkane from olefin, which contains novel nickel or palladium complexes. In the presence of the catalytic system, highly branched oily alkane mixture can be efficiently obtain