varying from 2.9 to 22.3 wt.%. The catalytic performance is mainly controlled by electronic effects at the phenoxy-imine ligands. The bis(ligand) chromium complex 4 showed good activity in ethylene oligomerization (TOF = 39,400 (mol ethylene)(mol Cr)−1 h−1), producing mostly oligomers (95.2 wt% of total products) with high selectivity for α-olefins. The highest activity among the six precatalysts screened
通式为[Cr ZNO}(THF)Cl 2的
铬配合物] [ 2a,ZNO = C 9 H 6
N-8-(N = CH)-
2,4-叔丁基-2-(OC 6 H 2); 2b, ZNO = Ph(NH)-C 2 H 4-(N = CH)-2,4-叔丁基-2-(OC 6 H 2 );2c,ZNO = 2-MeO-Ph-CH 2-(N = CH)-2,4-叔丁基-2-(OC 6 H 2);2d,ZNO =
2-PhO-Ph-(N = CH)-2,4-叔丁基-2-(OC 6 H 2);2e,ZNO = PhO-C 2 H 4-(N = CH)-
2,4-叔丁基-2-(OC 6 H 2)]和双(
配体)络合物[Cr C 9 H 6
N-8-NH 2 } 2 Cl 2 ] Cl (4)进行了synthetized和表征通过元素分析,红外光谱,并且通过X射线晶体为4。在固态下,4是单体,其中两个8-
氨基-
喹啉