Ethylene Oligomerization
Mostrando 1-6 de 6 artigos, teses e dissertações.
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1. Synthesis, Characterization and Ethylene Oligomerization Studies of Chromium Complexes Bearing Imino-Furfural Ligands
Uma série de complexos de cromo(III) contendo ligantes imina-furfural (Cr1-Cr4) foram sintetizados e caracterizados por espectrometria de massas de alta resolução (HRMS). Todos os pré-catalisadores de cromo, ativados com metilaluminoxano (MAO), apresentaram atividade moderada na oligomerização do etileno [frequência de rotação (TOF) = 11.800-23.200
J. Braz. Chem. Soc.. Publicado em: 2014-12
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2. Oligomerização de olefinas leves catalisada por complexos contendo ligantes B-diimina heterogeneizados em sílica
This work describes ¿-diimine ligands synthesis and the corresponding nickel complexes, homogeneous and heterogeneized, its catalytic application in ethylene oligomerization. Initially held the ¿-diimine ligands synthesis with different substituents in the aromatic ring. These ligands were characterized by CHN elemental analysis, IR, UV-Vis and 1H NRM. Fro
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2011
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3. Substituted tridentate pyrazolyl ligands for chromium and nickel-catalyzed ethylene oligomerization reactions: effect of auxiliary ligand on activity and selectivity
Dois novos complexos de cromo(III) contendo ligantes tridentados [CrCl3(L)] (1a, L = bis[2-(3-fenil-1-pirazol)etil)]amina; 2a, L = bis[2-(3-metil-5-fenil-l-pirazol)etil]sulfeto) foram preparados e caracterizados por análise elementar. Após ativação com metilaluminoxano (MAO), estes pré-catalisadores mostraram altas frequências de rotação nas reaçõe
Publicado em: 2011
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4. Substituted tridentate pyrazolyl ligands for chromium and nickel-catalyzed ethylene oligomerization reactions: effect of auxiliary ligand on activity and selectivity
Dois novos complexos de cromo(III) contendo ligantes tridentados [CrCl3(L)] (1a, L = bis[2-(3-fenil-1-pirazol)etil)]amina; 2a, L = bis[2-(3-metil-5-fenil-l-pirazol)etil]sulfeto) foram preparados e caracterizados por análise elementar. Após ativação com metilaluminoxano (MAO), estes pré-catalisadores mostraram altas frequências de rotação nas reaçõe
Journal of the Brazilian Chemical Society. Publicado em: 2010
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5. Novel catalyst systems based on Ni(II), Ti(IV), and Cr(III) complexes for oligo-and polymerization of ethylene
The complex of Brookhart Ni(α-diimine)Cl2 (1) (α-diimine = 1,4-bis(2,6- diisopropylphenyl)-acenaphthenediimine) has been characterized after impregnation on silica (S1) and MAO-modified silicas (4.0, 8.0 and 23.0 wts.% Al/SiO2 called S2, S3 and S4, respectively). The treatment of these heterogeneous systems with MAO produces some active catalysts for the p
Publicado em: 2007
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6. Self-assembly of simian virus 40 large T antigen oligomers by divalent cations.
In simian virus 40-transformed cells, simian virus 40 large T antigen can be detected in different forms separable by sucrose density gradient centrifugation. In our experiments, light forms sedimented around 5 to 7S, oligomers such as tetramers were detected around 16S, and higher aggregates sedimented in a broad distribution reaching above 23S. The oligome