Nickel-catalyzed propylene dimerization in organochloroaluminate ionic liquids: Control of the isomerization reaction

Souza, Roberto Fernando de; Leal, Bárbara C.; Souza, Michèle Oberson de; Thiele, Daniel

doi:10.1016/j.molcata.2007.03.003

Cited by 18 publications

(9 citation statements)

References 18 publications

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“…The composition analyses indicate that the nickel active species catalyze olefin oligomerization and isomerization simultaneously. [25,27] Similar oligomerization results were observed with other nickel complexes. [20,24] …”

Section: Composition Of Oligomerssupporting

confidence: 81%

“…The good solubility of nickel complexes and poor solubility of olefin products in polar and non-coordinating ionic liquids enable the separation of the reaction products by simple decantation, allowing easy recycling of catalyst in the IL solution. Oligomerizations of ethylene, [20 -24] propylene [16,18,25,26] and 1-butene, [27 -32] with nickel catalysts in ionic liquids have been reported by several research groups over recent years.…”

Section: Introductionmentioning

confidence: 99%

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Biphasic oligomerization of ethylene with nickel complexes immobilized in organochloroaluminate ionic liquids

Pei

Liu

Gao

et al. 2009

Applied Organom Chemis

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Ethylene was selectively oligomerized by nickel complexes such as (PPh 3 ) 2 NiBr 2 and (PPh 3 ) 2 NiCl 2 immobilized in chloroaluminate ionic liquid in biphasic catalytic reactions. The influence of reaction parameters such as reaction media, reaction temperature and Et 2 AlCl : Ni molar ratio was also evaluated. Turnover frequency up to 24000 mol C 2 H 4 /(mol Ni h) was achieved under mild reaction conditions (0.5 atm and 40• C). GC-MS analyses showed that the obtained oligomers completely consist of C4 and C6. The olefinic products can be easily separated from the catalytic ionic liquid phase by simple decantation, and the nickel catalyst can be reused without a significant decrease in turnover frequency and change of the distribution of the olefinic products.

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Section: Composition Of Oligomerssupporting

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Biphasic oligomerization of ethylene with nickel complexes immobilized in organochloroaluminate ionic liquids

Pei

Liu

Gao

et al. 2009

Applied Organom Chemis

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“…As can be seen, an increase in the amount of the alkylaluminium compound results in an increase of the total catalyst activity, but only to some extent. This has also been reported for both olefin polymerization and oligomerization in the ionic liquid media [45][46][47]. It should be noticed that AlEt 2 Cl is better for the biphasic process because the majority of the product is transported to the hexane phase.…”

Section: Polymerization Reactionsupporting

confidence: 70%

Effect of immobilization of titanocene catalyst in aralkyl imidazolium chloroaluminate media on performance of biphasic ethylene polymerization and polyethylene properties

2012

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], were applied as media of the Cp 2 TiCl 2 catalyst for biphasic ethylene polymerization. The studied aralkyl ionic liquids ensure greater stability of the catalyst at higher temperatures and more regular morphology of the produced polyethylene than analogous 1-n-alkyl-3-methylimidazolium chloroaluminates. The alkylaluminium compound participates in the termination reaction of the polymer chain. The catalyst is stable and enables recycling of the ionic liquid phase in the consecutive polymerization reactions. The [Ph-C 2 mim][AlCl 4 ] ionic liquid and AlEt 2 Cl alkylaluminium compound turned out to be the most suitable for the biphasic process. The influence of the kind of ionic liquid, alkylaluminium compound (AlEt 2 Cl and AlEtCl 2 ), activator/catalyst molar ratio, reaction temperature, reaction time and catalyst recycling on the polymerization performance as well as polyethylene properties such as molecular weight (M w ), polydispersity, melting temperature, crystallinity degree, bulk density and particle size is presented.

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“…With complex 3 activated with Et 2 AlCl in n-heptane or toluene, only dimers (C4) and small amount of trimers (C6) were produced while in the biphasic systems, not only the lower olefins but also C8 olefins were obtained. Therefore, we can assume that the nickel metal active species in IL favor chain growth [14,19].…”

Section: Ethylene Oligomerization In Various Mediamentioning

confidence: 99%

“…The good solubility of nickel complexes and poor solubility of olefin products in polar and non-coordinating ionic liquids enable the separation of the reaction products by simple decantation, allowing easy recycling of catalyst in the IL solution. Oligomerizations of ethylene [14][15][16][17][18], propylene [11,13,19,20], and 1-butene [20][21][22][23][24][25][26], with nickel catalysts in ionic liquid have been reported by several research groups over the past several years.…”

Section: Introductionmentioning

confidence: 99%

Ionic Liquid-Supported Bis-(salicylaldimine) Nickel Complexes: Robust and Recyclable Catalysts for Ethylene Oligomerization in Biphasic Solvent System

et al. 2009

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Two new ionic liquid-supported bis-(salicylaldimine) Ni(II) complexes Ni[2-(O)C 6 H 4 CH=N(CH 2 ) 3 (methylimidazole)Br] 2 (1) and Ni[3, 5-t Bu 2 -2-(O)C 6 H 2 CH= N(CH 2 ) 3 (methylimidazole)Br] 2 (2) have been synthesized and characterized. Ethylene oligomerizations were carried out with these two complexes in biphasic solvent systems consisting of chloroaluminate ionic liquid and n-heptane or toluene under mild reaction conditions. In the presence of diethylaluminum chloride, both complexes 1 and 2 are highly active for ethylene oligomerization. The olefinic products can be easily separated from the catalytic ionic liquid phase by simple decantation, and the nickel catalysts can be reused in successive ethylene oligomerization cycles. GC-MS analyzes showed that the obtained oligomers contained mainly C4, C6, and C8 olefins.

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Nickel-catalyzed propylene dimerization in organochloroaluminate ionic liquids: Control of the isomerization reaction

Cited by 18 publications

References 18 publications

Biphasic oligomerization of ethylene with nickel complexes immobilized in organochloroaluminate ionic liquids

Biphasic oligomerization of ethylene with nickel complexes immobilized in organochloroaluminate ionic liquids

Effect of immobilization of titanocene catalyst in aralkyl imidazolium chloroaluminate media on performance of biphasic ethylene polymerization and polyethylene properties

Ionic Liquid-Supported Bis-(salicylaldimine) Nickel Complexes: Robust and Recyclable Catalysts for Ethylene Oligomerization in Biphasic Solvent System

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