Chromium complexes of three new ligands, Ph2PN(Me)(CH2)2-X [X = NMe2(PNN); PPh2 (PNP); Py (PNPy)], have been examined vis-à-vis their ability to promote ethylene tetramerization, (PNN)CrCl3(L) [L = THF (1); CH3CN (2)], (PNPy)CrCl3(L) [L = THF (3); CH3CN (4)], and (PNP)CrCl3(THF) (5). In the case of 2 and 4, it was possible to grow crystals suitable for X-ray diffraction. The reaction of 3 with Et3Al
三种新
配体的
铬配合物,Ph 2
PN(Me)(CH 2)2 -X [X = NMe 2 (
PNN);PPh 2(
PNP);Py (
PNPy)],已针对其促进
乙烯四聚的能力(
PNN)CrCl 3(L)[L = THF(1);CH 3 CN(2)],(
PNPy)CrCl 3(L)[L = THF(3); CH 3 CN(4)]和(
PNP)CrCl 3(THF)(5)。在2和4的情况下,有可能生长出适合X射线衍射的晶体。3与Et 3 Al的反应得到双核[(HN(Me)(CH 2)2 Py)CrCl 2 Et] 2(6),其包含与Et基团连接的三价
铬。但是,在烷基化过程中,
配体已被片段化,除去了侧臂,并使剩余的NP残基的N原子质子化。已经测试了所有配合物的
乙烯低聚活性。复杂1中
三聚氰胺氰尿酸酯所显示的最高选择性为1-
辛烯,在激活时具有
DMAO。与预期相反,配合物6不是自活化催化剂。