Selective Oligomerization of Ethylene to Linear α-Olefins by Tetrahedral Cobalt(II) Complexes with 6-(Organyl)-2-(imino)pyridyl Ligands:  Influence of the Heteroatom in the Organyl Group on the Catalytic Activity
                                
                                    
                                        作者:Claudio Bianchini、Giuseppe Mantovani、Andrea Meli、Fabio Migliacci、Franco Laschi                                    
                                    
                                        DOI:10.1021/om030227d
                                    
                                    
                                        日期:2003.6.1
                                    
                                    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.