Pendant arm Schiff base complexes of aluminium as ethylene polymerisation catalysts

Abstract

The potentially tridentate Schiff base ligands [3,5-Bu^t₂-2-(HO)C₆H₂CH[double bond, length half m-dash]NL] 1, on reaction with Me₃Al at room temperature, afford the complexes [(3,5-Bu^t₂-2-(O)C₆H₂CH[double bond, length half m-dash]NL)AlMe₂] [L = CH₂CH₂NMe₂ 2a, (2-PhO)C₆H₄ 2b, 2-CH₂C₅H₄N 2c and 8-C₉H₆N (quinoline) 2d], 2a and 2c have been characterised crystallographically; further reaction of the dimethyl compounds with B(C₆F₅)₃ affords the cationic systems [(3,5-Bu^t₂-2-(O)C₆H₂CH[double bond, length half m-dash]NL)AlMe]⁺ 3a–d of which 3a and 3b are ethylene polymerisation catalysts.

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