Vanadium (IV), (V) coordination compounds with 8-hydroxyquinoline derivative: Synthesis, structure and catalytic activity in the polymerization of ethylene

Тuskaev, Vladislav А.; Kolosov, Nikolay A.; Kurmaev, Dmitrii A.; Гагиева, С. Ч.; Khrustalev, Victor N.; Ikonnikov, Nikolay S.; Ефимов, Н. Н.; Ugolkova, E. A.; Минин, В. В.; Булычев, Б. М.

doi:10.1016/j.jorganchem.2015.04.004

Cited by 13 publications

(8 citation statements)

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“…10 –10 s) which is the well‐documented mononuclear V IV EPR spectrum. [5a], The 8‐line feature also excludes the possibility of existence of delocalized V IV ‐V V electronic state which has been shown to display a 15‐line EPR signal . In combination with EPR results, the magnetic susceptibility of the paramagnetic species was determined by the Evans method (Figure S15), which corresponds to the formation of two mononuclear V IV intermediates.…”

Section: Resultsmentioning

confidence: 99%

Selective C_α Alcohol Oxidation of Lignin Substrates Featuring a β‐O‐4 Linkage by a Dinuclear Oxovanadium Catalyst via Two‐Electron Redox Processes

et al. 2019

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Developing highly efficient catalyst systems to transform lignin biomass into value-added chemical feedstocks is imperative for utilizing lignin as renewable alternatives to fossil fuels. Recently, the pre-activated strategy involving the selective oxidation of C α alcohol of lignin substrates containing ( -O-4 linkage mode has been demonstrated to significantly increase the depolymerization efficiency of native aspen lignin from 10-20 to 60 wt.-%. In this study, we reported the synthesis of a dinuclear oxovanadium complex 2 that is capable of selectively oxidizing the C α alcohol (80 -100% selectivity) of various dimeric lignin substrates under a mild condition. Further investigation of catalytic mechanism has revealed that two V=O motifs [a] 4641 Scheme 4. Proposed catalytic mechanism of selective C α alcohol oxidation of a lignin substrate containing -O-4 Linkage.Center for High-Performance Computing (NCHC) for their support on the hardware and software applied in this work. The authors thank Mr. Ting-Shen Kuo for single-crystal X-ray structural determinations.

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Section: Resultsmentioning

confidence: 99%

Selective C_α Alcohol Oxidation of Lignin Substrates Featuring a β‐O‐4 Linkage by a Dinuclear Oxovanadium Catalyst via Two‐Electron Redox Processes

et al. 2019

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“…A series of oxovanadium (IV and V) complexes bearing the [ON] À or [OON] 2À ligands derived from 7-(hexafluoro-2-hydroxypropane-2-yl)-8-hydroxyquinolines were tested in ethylene polymerization. 25 When activated by DEAC/ETA (V:Al:ETA = 1:300:30), moderate activities were observed, with the highest being with an "ordinary" 8-hydroxyquinolate dimer with a bridging oxygen, vanadium(V) complex 6, achieving 1.0 Â 10 6 g mol À1 h À1 and molecular weight as M w = 1.73 Â 10 5 . Complex 7, with a + 4 oxidation state, produced only a trace amount of polyethylene, but its higher oxidation state analogue 8 showed an activity of 0.92 Â 10 6 g mol À1 h À1 (M w = 1.70 Â 10 5 ).…”

Section: Introductionmentioning

confidence: 99%

Achieving ultra‐high molecular weight polyethylenes by vanadium aroylhydrazine‐arylolates

Suo

Phillips

Sutradhar

et al. 2022

Journal of Polymer Science

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A series of vanadium(V) aroylhydrazine-arylolates is employed in ethylene polymerization to produce ultra-high molecular weight polyethylene (UHMWPE), surprisingly extending to such coupling reactions beyond their common usage in the oxidation of hexanes and alcohols. Activated by either MAO or DMAC, the complexes V1-V3 efficiently catalyze the polymerization of ethylene into UHMWPE, that is, with an activity up to 3.37 Â 10 6 g mol À1 h À1 (60 C) and the polyethylene obtained has a molecular weight around 3 million g mol À1 , being the highest molecular weight achieved by a vanadium catalyst so far. More importantly, the significant effects of different cocatalysts are well illustrated; the catalytic system with MAO generally shows lower activity with almost one order in the magnitude than that with DMAC (0.43 vs. 3.37 Â 10 6 g mol À1 h À1 ), but the polyethylenes with higher molecular weights are obtained by the system with MAO.

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“…In the last three decades, vanadium coordination compounds have received increasing interest due to their structural features , catalytic applications [21][22][23][24][25][26][27][28][29][30][31][32][33]45,46] and medicinal importance [33][34][35][36][37][38][39][40][41][42][43][44][47][48][49][50][51][52][53][54][55][56][57][58][59][60][61][62][63]. Particular attention has been paid to bis-chelated V IV O and V V O complexes of the general formula [V IV O(N∩O) 2 ], [V IV O(N∩O) 2 (solvent)] and [V V O(OR)(N∩O) 2 ].…”

Section: Introductionmentioning

confidence: 99%

Vanadium(IV) Complexes with Methyl-Substituted 8-Hydroxyquinolines: Catalytic Potential in the Oxidation of Hydrocarbons and Alcohols with Peroxides and Biological Activity

et al. 2021

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Methyl-substituted 8-hydroxyquinolines (Hquin) were successfully used to synthetize five-coordinated oxovanadium(IV) complexes: [VO(2,6-(Me)2-quin)2] (1), [VO(2,5-(Me)2-quin)2] (2) and [VO(2-Me-quin)2] (3). Complexes 1–3 demonstrated high catalytic activity in the oxidation of hydrocarbons with H2O2 in acetonitrile at 50 °C, in the presence of 2-pyrazinecarboxylic acid (PCA) as a cocatalyst. The maximum yield of cyclohexane oxidation products attained was 48%, which is high in the case of the oxidation of saturated hydrocarbons. The reaction leads to the formation of a mixture of cyclohexyl hydroperoxide, cyclohexanol and cyclohexanone. When triphenylphosphine is added, cyclohexyl hydroperoxide is completely converted to cyclohexanol. Consideration of the regio- and bond-selectivity in the oxidation of n-heptane and methylcyclohexane, respectively, indicates that the oxidation proceeds with the participation of free hydroxyl radicals. The complexes show moderate activity in the oxidation of alcohols. Complexes 1 and 2 reduce the viability of colorectal (HCT116) and ovarian (A2780) carcinoma cell lines and of normal dermal fibroblasts without showing a specific selectivity for cancer cell lines. Complex 3 on the other hand, shows a higher cytotoxicity in a colorectal carcinoma cell line (HCT116), a lower cytotoxicity towards normal dermal fibroblasts and no effect in an ovarian carcinoma cell line (order of magnitude HCT116 > fibroblasts > A2780).

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Vanadium (IV), (V) coordination compounds with 8-hydroxyquinoline derivative: Synthesis, structure and catalytic activity in the polymerization of ethylene

Cited by 13 publications

References 25 publications

Selective C_α Alcohol Oxidation of Lignin Substrates Featuring a β‐O‐4 Linkage by a Dinuclear Oxovanadium Catalyst via Two‐Electron Redox Processes

Selective C_α Alcohol Oxidation of Lignin Substrates Featuring a β‐O‐4 Linkage by a Dinuclear Oxovanadium Catalyst via Two‐Electron Redox Processes

Achieving ultra‐high molecular weight polyethylenes by vanadium aroylhydrazine‐arylolates

Vanadium(IV) Complexes with Methyl-Substituted 8-Hydroxyquinolines: Catalytic Potential in the Oxidation of Hydrocarbons and Alcohols with Peroxides and Biological Activity

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Vanadium (IV), (V) coordination compounds with 8-hydroxyquinoline derivative: Synthesis, structure and catalytic activity in the polymerization of ethylene

Cited by 13 publications

References 25 publications

Selective Cα Alcohol Oxidation of Lignin Substrates Featuring a β‐O‐4 Linkage by a Dinuclear Oxovanadium Catalyst via Two‐Electron Redox Processes

Selective Cα Alcohol Oxidation of Lignin Substrates Featuring a β‐O‐4 Linkage by a Dinuclear Oxovanadium Catalyst via Two‐Electron Redox Processes

Achieving ultra‐high molecular weight polyethylenes by vanadium aroylhydrazine‐arylolates

Vanadium(IV) Complexes with Methyl-Substituted 8-Hydroxyquinolines: Catalytic Potential in the Oxidation of Hydrocarbons and Alcohols with Peroxides and Biological Activity

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Selective C_α Alcohol Oxidation of Lignin Substrates Featuring a β‐O‐4 Linkage by a Dinuclear Oxovanadium Catalyst via Two‐Electron Redox Processes

Selective C_α Alcohol Oxidation of Lignin Substrates Featuring a β‐O‐4 Linkage by a Dinuclear Oxovanadium Catalyst via Two‐Electron Redox Processes