摘要:
                                The oligomerization of ethylene to alpha-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.