Abstract
Several bis(imino)pyridine cobalt (II) complexes have been synthesized and used in ethylene oligomerization in 1-methyl-3-butylimidazolium tetrachloroaluminate (BMI·AlCl 4) ionic liquid activated by methylaluminoxane (MAO). The ligand substitution pattern, with halogen, methyl or trifluoromethyl units in the ortho- and para-positions of the aromatic group, has a marked effect on activity and selectivity. The cobalt catalysts evaluated in this work exhibited activities in the range 4000–15,300 h −1 and selectivities towards ethylene dimerization to butenes above 90%. These catalysts also exhibited high selectivity to 1-butene formation, up to 87%.
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