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 catalysts oligomerize or polymerize ethylene 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
合成并表征了一系列26种双(芳基)吡啶铁(III)配合物,这些配合物在其配体骨架中包含吸电子或供电子取代基。用甲基铝氧烷(MAO)活化后,这些催化剂使乙烯低聚或聚合,得到直链和支链产物。与铁(II)配合物相反,在亚氨基苯基环上存在至少一种邻位取代基对于铁(III)配合物的催化活性不是强制性的。含有间位和对位取代的双(芳基吡啶)吡啶化合物的这类铁(III)配合物很容易获得,并且它们的低聚行为表明与众所周知的铁(II)类似物存在有趣的差异,因为在烯烃中同时发现了内部和分支烯烃。预期的直链α-烯烃以外的产物混合物。