Highly Active Half-Metallocene Chromium(III) Catalysts for Ethylene Polymerization Activated by Trialkylaluminum

Xu, Tao; Mu, Ying; Gao, Wei; Ni, Jianguo; Ye, Ling; Tao, Yong

doi:10.1021/ja0671363

Cited by 72 publications

(61 citation statements)

References 36 publications

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“…Closely related complexes 20 and 21 were reported by the same authors [27]. Both are inactive in the presence of MAO but lead to high molecular weight polyethylene with 25 Chromium complexes of b-diketiminate (NacNac) ligands, both mono-and bisligand, were introduced by Theopold [29] and Gibson [30]. These complexes led to moderate activities for ethylene polymerisation upon activation with Et 2 AlCl or MAO (with Et 2 AlCl generally superior) [1].…”

Section: Cr Complexes Of Cyclopentadienyl Ligands Containing Pendant mentioning

confidence: 86%

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Cr Complexes of Nitrogen Donor Ligands for Olefin Oligomerisation and Polymerisation

McGuinness

2011

Catalysis by Metal Complexes

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Chromium complexes continue to play an important role as catalysts for olefin oligomerisation and polymerisation, with many of these catalysts supported by N-donor containing ligation. A number of highly active catalysts for ethylene polymerisation have been developed in recent years, as well as new catalysts for highly selective ethylene oligomerisation. New developments in this area since 2003, in which chromium complexes of N-donor ligands are utilized, are discussed in subsequent sections.

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Section: Cr Complexes Of Cyclopentadienyl Ligands Containing Pendant mentioning

confidence: 86%

“…1.1). Complex 18, with a chelated phenoxy-imine ligand, is also activated with AlR 3 but gives rise to linear polyethylene [25]. The attraction of this catalyst is the low levels of AlR 3 [26].…”

Section: Cr Complexes Of Cyclopentadienyl Ligands Containing Pendant mentioning

confidence: 99%

Cr Complexes of Nitrogen Donor Ligands for Olefin Oligomerisation and Polymerisation

McGuinness

2011

Catalysis by Metal Complexes

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“…Cp*ZrCl 3 [35] and Ph 3 CB(C 6 F 5 ) 4 [36,37] were prepared according to literature procedures. The free salicylaldimine ligands HLa and HLb were prepared according to literature procedures [38] . Al i Bu 3 , n-BuLi and ZrCl 4 were purchased from Aldrich or Acros.…”

Section: Generalmentioning

confidence: 99%

“…The free salicylaldimineligands HLa and HLb were obtained as orange solids by the condensation reaction of iso-propylamine with the corresponding salicylaldehyde derivatives, and recrystallized from methanol according to a published procedure [38][39][40][41] in high yields. The pentamethyl substituted half metallocene(Cp*ZrCl 3 ) was prepared according to literature procedure [35] .…”

Section: Syntheses and Characterization Of Complexes 1 Andmentioning

confidence: 99%

New half-sandwich zirconium(IV) complexes containing salicylaldimine ligands: Synthesis, characterizations and catalytic properties

Liu

Yao

Wenlei

et al. 2014

Chem. Res. Chin. Univ.

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Two new half-sandwich zirconium(IV) complexes bearing salicylaldimine ligands of the type Cp*Zr[2-t Bu-4-R-6-(CH=N i Pr)C 6 H 2 O]Cl 2 [R=H(1), t Bu(2)] were prepared by the reaction of Cp*ZrCl 3 with the corresponding lithium of salicylaldimine ligands 2-t Bu-4-R-6-(CH=N i Pr)C 6 H 2 OLi[R=H(LiLa), t Bu(LiLb)]. Complexes 1 and 2 were characterized by 1 H NMR, 13 C NMR spectroscopy and elemental analysis. When activated with Al i Bu 3 and Ph 3 CB(C 6 F 5 ) 4 , both complexes 1 and 2 exhibited reasonable catalytic activities for ethylene polymerization, producing polyethylenes with moderate molecular weight. Complexes 1 and 2 also exhibited reasonable catalytic activities for ethylene copolymerization with 1-hexene, producing poly(ethylene-co-1-hexene)s with moderate molecular weight and reasonable 1-hexene content.

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“…Syndiotactic-rich atactic polymers with high molecular weight and broad molecular weight distribution were isolated [30]. Penta-coordinated chromium-based complexes have been applied as polymerization catalysts [31][32][33][34]. The complex, chlorobis(salicyladiminato)chromium(III) has been applied as a catalyst for ethylene polymerization in the presence of aluminum activators.…”

Section: Introductionmentioning

confidence: 99%

Salicylaldiminato-based cobalt(III)-, iron(III)-, and chromium(III)/methyl aluminoxane catalyst systems for polymerization of t-butyl acrylate

Abu‐Surrah

Ibrahim

Abdel-Halim

2009

Transition Met Chem

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A new series of penta-coordinated Co(III)-, Fe(III)-, and Cr(III)-complexes (6-10) bearing N-salicylidineisopropylaniline and sodium N-(4-sulfonitsalicylidineisopropyl-aniline) ligands has been synthesized and utilized, after activation with methyl aluminoxane, as catalysts for the polymerization of tert-butylacrylate (t-BA). High molar mass P(t-BA) polymers with very low molecular weight distributions were produced (M w /M n = 1.06-1.09). Cobalt-and chromium-based precatalysts showed higher activity towards the polymerization reaction than those of the iron complexes. The presence of sulfonated groups on the para position of the aryl group in the backbone of the ligand decreases the catalytic activity of the complexes. The ortho alkyl substituents on the aryl groups of the ligand have a favorable influence on the polymerization activity compared to the alkyl-free analogue (11).

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Highly Active Half-Metallocene Chromium(III) Catalysts for Ethylene Polymerization Activated by Trialkylaluminum

Abstract: Highly active half-metallocene type chromium(III) catalysts for ethylene polymerization have been developed. High molecular weight linear polyethylene (M n > 1 000 000 g/mol) was produced by these catalysts in the presence of a relatively small amount of AlR3 (25 equiv).

Cited by 72 publications

References 36 publications

Cr Complexes of Nitrogen Donor Ligands for Olefin Oligomerisation and Polymerisation

Cr Complexes of Nitrogen Donor Ligands for Olefin Oligomerisation and Polymerisation

New half-sandwich zirconium(IV) complexes containing salicylaldimine ligands: Synthesis, characterizations and catalytic properties

Salicylaldiminato-based cobalt(III)-, iron(III)-, and chromium(III)/methyl aluminoxane catalyst systems for polymerization of t-butyl acrylate

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