Bis(arylimino)pyridine iron(III) complexes as catalyst precursors for the oligomerization and polymerization of ethylene
作者:Christian Görl、Tanja Englmann、Helmut G. Alt
DOI:10.1016/j.apcata.2011.06.010
日期:2011.6
containing either electron withdrawing or electron donating substituents in their ligand frameworks was synthesized and characterized. After activation with methylaluminoxane (MAO), these catalystsoligomerize or polymerizeethylene to give both linear and branched products. In contrast to iron(II) complexes, the presence of at least one ortho-substituent at the iminophenyl rings is not obligative for catalytic
Iron, cobalt, chromium or vanadium complexes of 2,6-pyridinedicarboxaldehydes diimines and 2,6-diacylpyridines diimines which are suitable for catalyzing the oligomerization of ethylene to α-olefins exhibit more prolonged catalytic activity if aryl groups attached to the imino carbon atom(s) are substituted with at least one nitro group.