2-Aldiminophenoxytitanium chloride complexes: Synthesis, characterization, and ethylene (co-)polymerization behavior

Zhang, Wenjuan; Wang, Youhong; Redshaw, Carl; Hao, Xiang; Sun, Wen‐Hua

doi:10.1016/j.jorganchem.2012.05.048

Cited by 14 publications

(7 citation statements)

References 92 publications

(25 reference statements)

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“…Figures and show 13 C NMR spectra of copolymers produced by titanium ( 2a , 2b , 2d ) and zirconium ( 1a ) catalysts, respectively. The chemical shifts were assigned according to the data reported in, and the nomenclature of the structures in ethylene/1‐octene copolymers is given in Scheme . The signals are apparent at 14.0 ppm (1B6), 22.9 ppm (2B6), 27.3 ppm (5B6+βδ + ), 30.0 ppm (4B6+δ + δ + ), 30.5 ppm (γδ + ), 32.2 ppm (3B6), 34.6 ppm (6B6+αδ + ) i 38.2 ppm (CH) in the spectrum of the copolymer produced by 2a at a lower concentration of 1‐olefin, 0.19 mol/dm 3 (Fig.…”

Section: Resultsmentioning

confidence: 99%

Polypropylene and poly(ethylene-co -1-octene) effective synthesis with diamine-bis(phenolate) complexes: Effect of complex structure on catalyst activity and product microstructure

Białek

Bisz

2017

J. Polym. Sci. Part A: Polym. Chem.

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A series of group 4 metal complexes bearing amine-bis(phenolate) ligands with the amino side-arm donor: (l-O)2 (2d) are used in ethylene and propylene homopolymerization, and ethylene/1-octene copolymerization. All complexes, upon their activation with Al(iBu) 3 /Ph 3 CB(C 6 F 5 ) 4 , exhibit reasonable catalytic activity for ethylene homo-and copolymerization giving linear polyethylene with high to ultra-high molecular weight (600Á3 10 3 -3600Á3 10 3 g/mol). The activity of 1a/Al(iBu) 3 /Ph 3 CB(C 6 F 5 ) 4 shows a positive comonomer effect, leading to over 400% increase of the polymer yield, while the addition of 1-octene causes a slight reduction of the activity of the complexes 2a-2d.The complexes with the NMe 2 donor group (2a, 2d, 1a) display a high ability to incorporate a comonomer (up to 9-22 mol%), and the use of a bulkier donor group, N(iPr) 2 (2b, 2c), results in a lower 1-octene incorporation. All the produced copolymers reveal a broad chemical composition distribution. In addition, the investigated complexes polymerized propylene with the moderate (1a, 2a) to low (2b-2d) activity, giving polymers with different microstructures, from purely atactic to isotactically enriched (mmmm 5 28%).

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Section: Resultsmentioning

confidence: 99%

Polypropylene and poly(ethylene-co -1-octene) effective synthesis with diamine-bis(phenolate) complexes: Effect of complex structure on catalyst activity and product microstructure

Białek

Bisz

2017

J. Polym. Sci. Part A: Polym. Chem.

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“…The Al center is coordinated with one N atom and one O atom which adopts a similar coordination model as observed in their titanium analogues. 14 The geometry at aluminium can be best described as distorted tetrahedral, as evidenced in the bond angles for O1-Al1-N1 94. Fig.…”

Section: Resultsmentioning

confidence: 99%

Dimethylaluminium aldiminophenolates: synthesis, characterization and ring-opening polymerization behavior towards lactides

et al. 2012

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The stoichiometric reaction of the salicylaldimine derivatives (L1-L12) with trimethylaluminium afforded the corresponding dimethylaluminium aldiminophenolates (C1-C12), which were fully characterized by NMR spectroscopy and elemental analysis. The molecular structures of the representative complexes C1, C6, and C8 were determined by the single-crystal X-ray diffraction, which revealed distorted tetrahedral geometry at aluminium. Activation of the dimethylaluminium aldiminophenolates for the ring-opening polymerization required one equivalent of BnOH. On the basis of the polymerization results for L-lactide, D-lactide or rac-lactide, higher efficiency was observed for the ROP of D-lactide, and the nature of the ligands present significantly affected the observed catalytic activities and the properties of the resultant polylactides.

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“…Melting points were determined with an INESA‐WRR apparatus and are uncorrected. Ligand 3 was prepared according to a literature procedure . Ketones and silanes were degassed and dried using 4 Å molecular sieves.…”

Section: Methodsmentioning

confidence: 99%

Syntheses of Sterically Bulky Schiff‐Base Magnesium Complexes and Their Application in the Hydrosilylation of Ketones

Shen

Wang

et al. 2016

Eur J Inorg Chem

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The sterically bulky Schiff-base ligand 1 (L 1 H) was treated with CH 3 MgI in toluene to give the unexpected homoleptic magnesium complex 2 (L 1 MgL 1 ) in good yield. However, the reaction of sterically more bulky ligand 3 (L 2 H) with CH 3 MgI in diethyl ether yielded the desired heteroleptic magnesium iodide 4 [L 2 MgI(OEt 2 )], which was further reduced with sodium to produce the Mg-Na heterodimetallic complex 5. The crystal [a]

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2-Aldiminophenoxytitanium chloride complexes: Synthesis, characterization, and ethylene (co-)polymerization behavior

Cited by 14 publications

References 92 publications

Polypropylene and poly(ethylene-co -1-octene) effective synthesis with diamine-bis(phenolate) complexes: Effect of complex structure on catalyst activity and product microstructure

Polypropylene and poly(ethylene-co -1-octene) effective synthesis with diamine-bis(phenolate) complexes: Effect of complex structure on catalyst activity and product microstructure

Dimethylaluminium aldiminophenolates: synthesis, characterization and ring-opening polymerization behavior towards lactides

Syntheses of Sterically Bulky Schiff‐Base Magnesium Complexes and Their Application in the Hydrosilylation of Ketones

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