| Abstract
| - High throughput screening (HTS) of a 205 member Schiff base salicylaldimine ligand libraryderived from salicylaldehydes bearing bulky ortho-substituents, i.e., 9-anthracenyl, 1,4,5,8-tetramethylanthracenyl or triptycenyl, reacted in-situ with (p-tolyl)CrCl2(thf)3, identified two new classes of highly activechromium based systems for the oligomerization and polymerization of ethylene, respectively. Thepolymerization system comprises bidentate ortho-substituted anthracenyl Schiff bases bearing small primaryor secondary alkyl imine substituents. The oligomerization catalysts are based upon tridentate ortho-triptycenyl-substituted Schiff bases with pyridylmethyl or quinolyl substituents. Validation tests confirmedpolymerization productivities of up to 3000 g·mmol-1h-1bar-1 for the polymerization catalyst systems whilethe oligomerization catalysts gave productivities up to 10 000 g·mmol-1h-1bar-1. Key catalyst precursorshave been characterized by X-ray crystallography.
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