@article{Britovsek:2000,
author = {Britovsek, GJP and Bruce, M and Gibson, VC and Kimberley, BS and Maddox, PJ and Mastroianni, S and McTavish, SJ and Redshaw, C and Solan, GA and Strömberg, S and White, AJP and Williams, DJ},
journal = {Chemtracts},
pages = {303--308},
title = {Iron and cobalt ethylene polymerization catalysts bearing 2,6-bis(imino)pyridyl ligands: Synthesis, structures, and polymerization studies},
volume = {13},
year = {2000}
}

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TY  - JOUR
AB  - Chelating 2,6-bis(imino)pyridyl ligands, readily prepared via condensation reactions, coordinate to Fe(II), and Fe(III), and Co(II) halide salts to give monomeric, paramagnetic complexes. Activation of these compounds with methylaluminoxane results in highly reactive catalytic species for the production of linear polyethylene. Iron-based catalysts were found to be more active than cobalt-based systems, and ketimine ligands generally imparted enhanced efficiency compared to the analogous aldimine ligands. Bulky substituents at the ortho positions of the aryl groups were found to be crucial for optimal catalytic activity. Investigations of the various reaction conditions, including amount of MAO, ethylene pressure, reaction time and temperature, revealed that chain termination likely proceeds via two competing mechanisms, namely β-H transfer and chain transfer to aluminum.
AU  - Britovsek,GJP
AU  - Bruce,M
AU  - Gibson,VC
AU  - Kimberley,BS
AU  - Maddox,PJ
AU  - Mastroianni,S
AU  - McTavish,SJ
AU  - Redshaw,C
AU  - Solan,GA
AU  - Strömberg,S
AU  - White,AJP
AU  - Williams,DJ
EP  - 308
PY  - 2000///
SN  - 1431-9268
SP  - 303
TI  - Iron and cobalt ethylene polymerization catalysts bearing 2,6-bis(imino)pyridyl ligands: Synthesis, structures, and polymerization studies
T2  - Chemtracts
VL  - 13
ER  - 

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