Novel titanium(iv) complexes with 2,4-di-tert-butyl-6-(1,1,1,3,3,3-hexafluoro-2-hydroxypropan-2-yl)phenol in ethene polymerization

Solov’ev, M. V.; Гагиева, С. Ч.; Тuskaev, Vladislav А.; Bravaya, N. M.; Gadalova, O. E.; Khrustalev, Victor N.; Borissova, Alexandra O.; Булычев, Б. М.

doi:10.1007/s11172-011-0342-1

Cited by 29 publications

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“…Synthesis, struc ture, and catalytic activity of complex 3 in polymerization of ethylene was described earlier. 5 The synthesis of titani um 3, 4 and vanadium 5, 6 coordination compounds are given on Scheme 1.…”

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Oligomerization of higher olefins on titanium(+4) and vanadium(+5) coordination compounds with 2-hydroxymethylphenol derivatives

et al. 2014

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confidence: 99%

Oligomerization of higher olefins on titanium(+4) and vanadium(+5) coordination compounds with 2-hydroxymethylphenol derivatives

et al. 2014

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“…Figure shows the dinuclear structure of 1a . The two hafnium centers are bridged by the two alkoxide oxygen atoms of the N,O-chelating ligands to form a planar Hf 2 O 2 unit, as is typical for alkoxide-bridged dinuclear complexes. , The Hf–O1 bond distance (2.150(7) Å) is longer than that of Hf1–O1* (2.104(8) Å), and the distance between Hf1 and Hf1* (3.5180(10) Å) indicates no direct metal–metal interaction. Each hafnium center adopts a distorted-trigonal-bipyramidal geometry, in which O1, C32, and C25 occupy the equatorial plane around Hf1, while O1* and N1 are placed at the apical sites.…”

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Synthesis, Structure, and Reactivity of Dicationic Bimetallic Tetrabenzyldihafnium Complexes Bearing a Chelating (2-Hydroxyethyl)amido Ligand

et al. 2020

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We prepared the bimetallic hafnium complex 1 by reaction of Hf(CH 2 Ph) 4 with the alcohol-imine proligand L via deprotonation and subsequent benzyl migration from the hafnium atom to the imine moiety of L. The complex 1 was obtained as a diastereomeric mixture of 1a (SR, heterochiral) and 1b (RR and SS, homochiral); the SR isomer 1a was readily isolated by simply washing with toluene. Treatment of 1a with [Ph 3 C][B(C 6 F 5 ) 4 ] in C 6 H 5 Cl afforded the dicationic complex 2a, which was characterized by spectroscopic data and an X-ray diffraction study, revealing the η 6 coordination of the phenyl group bound to the chelating ligand to the cationic hafnium center. Complex 2a showed catalytic activity for 1-hexene oligomerization at 100 °C in combination with 2 equiv of [Ph 3 C][B(C 6 F 5 ) 4 ], while 4,4′dimethoxydiphenylacetylene reacted with 2a to quantitatively afford alkene 3 at room temperature after hydrolysis. The addition of PMe 2 Ph and pyridine to 2a dissociated the η 6 -arene coordination of the ligand to give the corresponding adducts 5a and 6a, whose structures were fully characterized by X-ray diffraction analysis. Article pubs.acs.org/Organometallics

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A Novel Catalytic System of [O,O] Bidentate Titanium Complexes and Et₂AlCl/Bu₂Mg for the Production of Ultra‐High Molecular Weight Polyethylene

Wen,

Zheng,

et al. 2024

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A bidentate ligand, 2,3‐dihydro‐2,2‐dimethyl‐7‐benzofuranol (ddbfOH), is used to synthesize the titanium complexes, ddbfOTi(OiPr)3(1) and (ddbfO)2Ti(OiPr)2(2). Combined with diethylaluminium chloride (Et2AlCl) and di‐n‐butylmagnesium (Bu2Mg), complexes 1 and 2 exhibit super high activity towards ethylene polymerization, and giving the ultra‐high molecular weight polyethylene (UHMWPE). After rationally optimizing the experimental conditions, the highest polymerization activity is achieved in both 1/ and 2/Et2AlCl/Bu2Mg catalytic systems (213.6×106 g‐PE⋅mol‐Ti−1 h−1, 142.8×106 g‐PE⋅mol‐Ti−1 h−1). The highest molecular weight (Mv =1905×104) can be achieved under a low polymerization temperature (−30 °C) at the expense of activity (3000 g‐PE⋅mol‐Ti−1 h−1). Additionally, through the investigation of various polymerization conditions on the activity and molecular weight of the catalytic system, we have found that the ratio of the catalyst and cocatalyst has a more significant impact on both activity and molecular weight.

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Novel titanium(iv) complexes with 2,4-di-tert-butyl-6-(1,1,1,3,3,3-hexafluoro-2-hydroxypropan-2-yl)phenol in ethene polymerization

Cited by 29 publications

References 32 publications

Oligomerization of higher olefins on titanium(+4) and vanadium(+5) coordination compounds with 2-hydroxymethylphenol derivatives

Oligomerization of higher olefins on titanium(+4) and vanadium(+5) coordination compounds with 2-hydroxymethylphenol derivatives

Synthesis, Structure, and Reactivity of Dicationic Bimetallic Tetrabenzyldihafnium Complexes Bearing a Chelating (2-Hydroxyethyl)amido Ligand

A Novel Catalytic System of [O,O] Bidentate Titanium Complexes and Et₂AlCl/Bu₂Mg for the Production of Ultra‐High Molecular Weight Polyethylene

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Novel titanium(iv) complexes with 2,4-di-tert-butyl-6-(1,1,1,3,3,3-hexafluoro-2-hydroxypropan-2-yl)phenol in ethene polymerization

Cited by 29 publications

References 32 publications

Oligomerization of higher olefins on titanium(+4) and vanadium(+5) coordination compounds with 2-hydroxymethylphenol derivatives

Oligomerization of higher olefins on titanium(+4) and vanadium(+5) coordination compounds with 2-hydroxymethylphenol derivatives

Synthesis, Structure, and Reactivity of Dicationic Bimetallic Tetrabenzyldihafnium Complexes Bearing a Chelating (2-Hydroxyethyl)amido Ligand

A Novel Catalytic System of [O,O] Bidentate Titanium Complexes and Et2AlCl/Bu2Mg for the Production of Ultra‐High Molecular Weight Polyethylene

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A Novel Catalytic System of [O,O] Bidentate Titanium Complexes and Et₂AlCl/Bu₂Mg for the Production of Ultra‐High Molecular Weight Polyethylene