Syntheses, Structures, and Catalytic Ethylene Oligomerization Behaviors of Bis(phosphanyl)aminenickel(II) Complexes Containing
<i>N</i>
‐Functionalized Pendant Groups
作者:Keming Song、Haiyang Gao、Fengshou Liu、Jin Pan、Lihua Guo、Shaobo Zai、Qing Wu
DOI:10.1002/ejic.200900256
日期:2009.7
N-functionalized bis(phosphanyl)amine ligands respectively containing benzyl, furfuryl, thiophene-2-methyl, thiophene-2-ethyl, and 2-picolyl groups (1a–e) were synthesized and characterized. The ligands reacted with (DME)NiBr2 in CH2Cl2 to give their corresponding nickel complexes [Ph2PN(R)PPh2NiBr2] [R = CH2C6H5 (2a), CH2C4H3O (2b), CH2C4H3S (2c), CH2C5H4N (2d), and CH2CH2C4H3S (2e)]. The structures of these
合成并表征了分别含有苄基、糠基、噻吩-2-甲基、噻吩-2-乙基和2-甲基吡啶基团的几种N-官能化双(膦酰基)胺配体(1a-e)。配体与 CH2Cl2 中的 (DME)NiBr2 反应得到相应的镍配合物 [Ph2PN(R)PPh2NiBr2] [R = CH2C6H5 (2a)、CH2C4H3O (2b)、CH2C4H3S (2c)、CH2C5H4N (2d) 和 CH2CH2C4H )]。这些配合物的结构是通过单晶 X 射线晶体学确定的。所有这些镍配合物在甲基铝氧烷或 Et2AlCl 存在下对乙烯低聚反应具有高度活性,产生高含量的丁烯 (C4)。特别是对于含有噻吩-2-乙基侧基的 2e,在 –40 °C 下获得的低聚产物含有 95.9 mol-% 的 C4 馏分和 100 mol-% 的 1-丁烯。然而,超过 50°C,