Can I read Pyrazolyl Iron, Cobalt, Nickel, and Palladium Complexes: Synthesis, Molecular Structures, and Evaluation as Ethylene Oligomerization Catalysts on EtoBox?

Pyrazolyl Iron, Cobalt, Nickel, and Palladium Complexes: Synthesis, Molecular Structures, and Evaluation as Ethylene Oligomerization Catalysts by Michael K. Ainooson; Stephen O. Ojwach; Ilia A. Guzei; Lara C. Spencer; James Darkwa is a Chemistry article available to read on EtoBox.

What is Pyrazolyl Iron, Cobalt, Nickel, and Palladium Complexes: Synthesis, Molecular Structures, and Evaluation as Ethylene Oligomerization Catalysts about?

Reactions of [2-(3,5-dimethyl-pyrazol-1-yl)-ethanol] (L1) and [1-(2-chloro-ethyl)-3,5-dimethyl-1H-pyrazole] (L2) with Fe(II), Co(II), Ni(II), and Pd(II) salts gave the complexes 6), and [(L2) 2 NiBr 2 ] (7). Whereas L2 behaves as a monodentate ligand, L1 can behave as either a monodentate or bidentate ligand depending on the nature of the metal centre. For palladium, L1 is monodentate in the solid state structure of 5 but bidentate in the structure of 4, obtained during attempts to crystallize 3. While the activation of iron, cobalt and palladium complexes with EtAlCl 2 did not produce active ethylene oligomerization catalysts, the nickel complexes 3 and 7 produced active ethylene oligomerization catalysts. Activities as high as 4329 kg/mol Ni h were obtained. Catalyst 3 produced mainly butenes (57%) and hexenes (43%); of which a combined 20% were converted to Friedel-Crafts alkylated-toluene. Catalyst 7, on other hand, produced mainly butenes (90%) and small amounts of hexenes (10%) which were then completely converted to the corresponding Friedel-Crafts alkylated-toluene products. This difference in product distribution in catalysis performed by complexes 3 and 7 is indicative of

Who reads Pyrazolyl Iron, Cobalt, Nickel, and Palladium Complexes: Synthesis, Molecular Structures, and Evaluation as Ethylene Oligomerization Catalysts?

Author

Michael K. Ainooson; Stephen O. Ojwach; Ilia A. Guzei; Lara C. Spencer; James Darkwa

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0022-328X)

Published

2011

Language

EN

Field

Chemistry (Physical Sciences)