Vanadium (V) and titanium (IV) compounds with 2-[hydroxy(diaryl)methyl]-8-hydroxyquinolines: Synthesis, structure and catalytic behaviors to olefin polymerization

Kolosov, Nikolay A.; Тuskaev, Vladislav А.; Гагиева, С. Ч.; Fedyanin, Ivan V.; Khrustalev, Victor N.; Polyakova, O. V.; Булычев, Б. М.

doi:10.1016/j.eurpolymj.2016.12.025

Cited by 22 publications

(14 citation statements)

References 41 publications

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“…Scheme c; non‐bonding I⋅⋅⋅O separations 309.7(3) and 313.6(3) pm for 2 a , and 308.2(2) pm for 2 b ). This model is in agreement with the observed Ti–O distances ( 2 a : 176.5(3)–176.6(3) pm; 2 b : 172.9(2) pm), which are comparable to values for other titanium alcoholates . Compound 2 a displays a centrosymmetric dinuclear structure, comprising a complex [Ti 2 Cl 6 (L) 4 ] 2+ cation and two chloride counterions (Figure a).…”

Section: Methodssupporting

confidence: 88%

A Tunable Trifluoromethyliodonium Reagent

et al. 2019

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Four complexes of MCl4 (M=Ti, Zr, Hf) with the hypervalent trifluoromethyl iodine reagent trifluoromethyl‐1,3‐dihydro‐3,3‐dimethyl‐1,2‐benziodoxole (1,=L) are described. With TiCl4, an I−O bond cleavage occurs, leading to the formation of the trifluoromethyliodonium alcoholate complexes [Ti2Cl6(L)4]Cl2 (2 a) and Ti2Cl8(L) (2 b). Reactions with ZrCl4 and HfCl4 form the complexes ZrCl4(L)2 (3) and HfCl4(L)2 (4), respectively, wherein the original I−O bond is retained and elongated compared to that in free 1. Therefore, the reactivity of 1 can be easily and practically fine‐tuned by addition of different metal chlorides, following the order ZrCl4/HfCl4

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Section: Methodssupporting

confidence: 88%

A Tunable Trifluoromethyliodonium Reagent

et al. 2019

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“…[8,9] 2a hat eine zentrosymmetrische zweikernige Struktur mit einem komplexen [Ti 2 Cl 6 (L) 4 ] 2+ -Kation und zwei Chlorid-Gegenionen (Abbildung 2a). Dieses Modell passt zu den ermittelten Ti-O-Abständen (2a:176.5(3)-176.6(3) pm; 2b:172.9(2) pm), denn diese sind vergleichbar mit denen in anderen Titan-Alkoholaten.…”

Section: Angewandte Chemieunclassified

“…Dieses Modell passt zu den ermittelten Ti-O-Abständen (2a:176.5(3)-176.6(3) pm; 2b:172.9(2) pm), denn diese sind vergleichbar mit denen in anderen Titan-Alkoholaten. [8,9] [7] und vergleichbar mit denen in protonierten Formen von 1,z .B.2 49.5(1) pm im HNTf 2 -Addukt. [5] Die Modellvorstellung neutraler Iodan-Liganden ist auch mit den M-O-Bindungslängen von 210.0(2) pm (3)u nd 209.3(2) pm (4) vereinbar.…”

Section: Angewandte Chemieunclassified

Ein abstimmbares Trifluormethyliodonium‐Reagenz

et al. 2019

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Vier Komplexe von MCl 4 (M = Ti,Z r, Hf) mit dem hypervalenten Trifluormethylierungs-Reagenz Trifluormethyl-1,3-dihydro-3,3-dimethyl-1,2-benziodoxol (1, = L) werden beschrieben. Mit TiCl 4 erfolgt eine I-O-Bindungsspaltung,d ie zur Bildung der Trifluormethyliodonium-Alkoholat-Komplexe [Ti 2 Cl 6 (L) 4 ]Cl 2 (2a)u nd Ti 2 Cl 8 (L) (2b)f ührt. Umsetzungen von 1 mit ZrCl 4 und HfCl 4 liefern die KomplexeZrCl 4 (L) 2 (3)u nd HfCl 4 (L) 2 (4), in denen die ursprünglicheI -O-Bindung bestehen bleibt, aber gegenüber derjenigen in freiem 1 verlängert ist. Somit kann die Reaktivitätvon 1 einfach und praktikabel durchZ ugabe verschiedener Metallchloride variiert werden, wobei die Reihenfolge ZrCl 4 /HfCl 4 < TiCl 4 < 2TiCl 4 gilt. 2a, 3 und 4 sind bemerkenswert lagerstabile Formen des aktivierten Reagenzes 1,während 2b leicht in situ zugänglichi st. 2a und 2b repräsentieren die ersten "echten" Iodan-basierten Trifluormethyliodonium-Reagenzien, also mit einer vollständig gespaltenen I-O-Bindung.E sw urde gezeigt, dass sich die neuen Komplexe zur Trifluormethylierung von para-Toluolsulfonat unter aprotischen Bedingungen eignen.

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“…Copolymer microstructure and properties are tightly connected with conditions of reaction and type of catalyst. Nowadays, interest in vanadium complexes is currently growing because they enable to obtain polymers of high molecular weight ( M w ) and narrow molecular weight distribution ( M w /M n ), copolymers of ethylene with higher 1-olefins or cyclic olefins with high comonomer incorporation in the copolymer chain [ 1 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 ]. However, a big disadvantage of vanadium compounds is their instability, they are easily reduced to lower, inactive oxidation state.…”

Section: Introductionmentioning

confidence: 99%

Structural and Thermal Properties of Ethylene-Norbornene Copolymers Obtained Using Vanadium Homogeneous and SIL Catalysts

et al. 2020

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The series of ethylene-norbornene (E-NB) copolymers was obtained using different vanadium homogeneous and supported ionic liquid (SIL) catalyst systems. The 13C and 1H NMR (carbon and proton nuclear magnetic resonance spectroscopy) together with differential scanning calorimetry (DSC) were applied to determine the composition of copolymers such as comonomer incorporation (CNB), monomer dispersity (MD), monomer reactivity ratio (re), sequence length of ethylene (le) and tetrad microblock distributions. The relation between the type of catalyst, reaction conditions and on the other hand, the copolymer microstructure, chain termination reaction analyzed by the type of unsaturation are discussed. In addition, the thermal properties of E-NB copolymers such as the melting and crystallization behavior, like also the heterogeneity of composition described by successive the self-nucleation and annealing (SSA) and the dispersity index (DI) were determined.

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Vanadium (V) and titanium (IV) compounds with 2-[hydroxy(diaryl)methyl]-8-hydroxyquinolines: Synthesis, structure and catalytic behaviors to olefin polymerization

Cited by 22 publications

References 41 publications

A Tunable Trifluoromethyliodonium Reagent

A Tunable Trifluoromethyliodonium Reagent

Ein abstimmbares Trifluormethyliodonium‐Reagenz

Structural and Thermal Properties of Ethylene-Norbornene Copolymers Obtained Using Vanadium Homogeneous and SIL Catalysts

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