2-Chloro/phenyl-7-arylimino-6,6-dimethylcyclopenta[b]pyridylnickel chlorides: Synthesis, characterization and ethylene oligomerization

2-Chloro/phenyl-7-arylimino-6,6-dimethylcyclopenta[b]pyridylnickel precatalysts, activated with either MAO or EASC, showed high activities for ethylene oligomerization, producing oligomers of butenes to dodecenes with R as Cl and butenes (C4) to hexenes (C6) with R as Ph.158