2-Benzoxazolyl-6-(1-(arylimino)ethyl)pyridyl cobalt (II) chlorides: A temperature switch catalyst in oligomerization and polymerization of ethylene

Gao, Rong; Wang, Kefeng; Li, Yan; Sun, Wen‐Hua; Redshaw, Carl; Bochmann, Manfred

doi:10.1016/j.molcata.2009.05.021

Cited by 49 publications

(39 citation statements)

References 38 publications

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“…87 Our group has also synthesized a family of 2-imino-1,10-phenanthroline ligands and the iron and cobalt complexes thereof. 91,[93][94][95] The preparative route was somewhat 20 complicated starting from phenanthroline, 2-acetyl-1,10-phenanthrolines and their substituted analogues were prepared. 91,93 Imino-phenanthrolines were then prepared by the reaction of the phenanthroline ketones or aldehydes with anilines, from which the corresponding metal complexes were 25 obtained.…”

Section: Other Tri-dentate Ligandsmentioning

confidence: 99%

“…The reader is directed to a raft of review articles that focus on early and some more recent developments. [6][7][8][9][10][11][12][13][14][15][16][17][18][19] The main driving force for such studies is to access new highly branched polyethylene products, whilst getting away from the 20 more oxophilic nature of early transition metal systems. In the past half-dozen or so years, stable complex pre-catalysts that exhibit high thermal stability have been reported for both cobalt 20 and iron complexes.…”

Section: Introductionmentioning

confidence: 99%

“…In this review, the synthesis of each family of iron and cobalt complex pre-catalysts is discussed together with characterization data and their oligo-/polymerization 45 behaviour; complexes bearing bi-dentate ligand sets are dealt with initially, followed by tri-dentate ligand sets and finally combinations thereof. 20 Studies of iron/cobalt complex pre-catalysts were initiated on tri-dentate systems and good activities were generally reported, 4,5 whilst by comparison, bi-dentate iron/cobalt complexes have tended to exhibit relatively low activity for ethylene reactivity. Such low activity is probably due to the 25 formation of unstable active species, which given the greater open space available at the metal, tend to be more prone to coordinating with other species present in the system (leading to deactivation).…”

Section: Introductionmentioning

confidence: 99%

“…26 At 10 bar ethylene, on increasing the reaction temperature from 20 to 60 o C, the catalytic activity decreased for cobalt precatalyst 67, and more low-molecular-weight oligomers were 20 formed. At 80 o C however, only trace polyethylene was isolated, but no oligomers.…”

mentioning

confidence: 99%

“…For the series of iron pre-catalysts with R 2 = Me, the activities order was R 1 = Me (54) > Ph (64) > iPr (60) > Et (56). 25 Aswell as the electronic influence used to explain the better activities of pre-catalysts 54 (Me) 45 and 64 (Ph), 20 the presence of bulkier substituents could protect the active species, ie Ph (64) > Pr (60) > Et (56). 4 …”

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confidence: 99%

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Bi- and tri-dentate imino-based iron and cobalt pre-catalysts for ethylene oligo-/polymerization

Feng

Wang

et al. 2014

Inorg. Chem. Front.

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119

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Recent progress on the use of iron and cobalt complex precatalysts for ethylene reactivity is reviewed. The review is organized in terms of the denticity of the chelate ligands 10 employed, with particular reference to the influence of the ligand frameworks and their substituents on the catalytic performance for ethylene oligomerization/polymerization catalysis. The majority of the systems bear tri-dentate ligation at the iron/cobalt centre, though it is clear that bi-dentate 15 iron/cobalt complex pre-catalysts have also attracted significant attention. Such systems produce in most cases highly linear products ranging from oligomeric α-olefins to high molecular weight polyethylene, and as such are promising candidates for both academic and industrial 20 considerations.

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Section: Other Tri-dentate Ligandsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Bi- and tri-dentate imino-based iron and cobalt pre-catalysts for ethylene oligo-/polymerization

Feng

Wang

et al. 2014

Inorg. Chem. Front.

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119

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Synthesis and characterization of Ni(II) complexes bearing of 2‐(1H–benzimidazol‐2‐yl)‐phenol derivatives as highly active catalysts for ethylene oligomerization

Haghverdi

Tadjarodi

Bahri‐Laleh

et al. 2017

Applied Organom Chemis

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Novel Ni(II) complexes of 2‐(1H–benzimidazol‐2‐yl)‐phenol derivatives (HLx: x = 1–5; C1–C5) have been synthesized and characterized. In the mononuclear complexes, the ligands were coordinated as bidentate, via one imine nitrogen and the phenolate oxygen atoms. The structures of the compounds were confirmed on the basis of FT‐IR, UV–Vis, 1H‐, 13C–NMR, inductively coupled plasma and elemental analyses (C, H and N). The purity of these compounds was ascertained by melting point (m.p.) and thin‐layer chromatography. The geometry optimization and vibrational frequency calculations of the compounds were performed using Gaussian 09 program with B3LYP/TZVP level of theory. All Ni(II) complexes were activated with diethylaluminum chloride (Et2AlCl), so that C2 showed the highest activity [6600 kg mol−1 (Ni) h−1], where the ligand contains a chlorine substituent. Oligomers obtained from the complexes consist mainly of dimer and trimer, and also exhibit high selectivity for linear 1‐butene and 1‐hexene. Both the steric and electronic effects of coordinative ligands affect the catalytic activity and the properties of the catalytic products.

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Cobalt(II)‐based ethylene dimerization catalysts with silicon‐bridged diphosphine ligands

Wei

Yu²,

Alam

et al. 2018

Applied Organom Chemis

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A series of ligands and cobalt complexes were synthesized and characterized using NMR spectroscopy, elemental analysis and single-crystal X-ray diffrac-features a monomeric structure with κ 2 coordination of the silicon-bridged diphosphine ligand to the cobalt center.Using dried methylaluminoxane (DMAO) and AlEt 3 as co-catalysts and methylcyclohexane as solvent, the Co(II) complex proved to be moderately active and highly selective for ethylene dimerization. The effects of ligand structure, catalyst loading, reaction temperature, Al/Co molar ratio, DMAO/ AlEt 3 molar ratio and reaction time were investigated with respect to the catalytic activity and product selectivity of ethylene dimerization. Cobalt complex C1 exhibited moderate catalytic activity of 2.3 × 10 5 g (mol Co ) −1 h −1 , with 100% selectivity towards C 4 (87% 1-C 4 in the C 4 fraction).

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2-Benzoxazolyl-6-(1-(arylimino)ethyl)pyridyl cobalt (II) chlorides: A temperature switch catalyst in oligomerization and polymerization of ethylene

Cited by 49 publications

References 38 publications

Bi- and tri-dentate imino-based iron and cobalt pre-catalysts for ethylene oligo-/polymerization

Bi- and tri-dentate imino-based iron and cobalt pre-catalysts for ethylene oligo-/polymerization

Synthesis and characterization of Ni(II) complexes bearing of 2‐(1H–benzimidazol‐2‐yl)‐phenol derivatives as highly active catalysts for ethylene oligomerization

Cobalt(II)‐based ethylene dimerization catalysts with silicon‐bridged diphosphine ligands

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