The oligomerization of ethylene to α-olefins has been obtained by MAO activation of tetrahedral Co II complexes of iminopyridines substituted in the 6-position of the pyridine ring by thiophen-2-yl, furan-2-yl, or phenyl groups. An intriguing heteroatom effect has been noticed on both activity and selectivity, together with a change in the Co II spin state upon activation of the dichloride precursors with MAO.
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Bianchini et al. (2003) studied this question.
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