New chiral α-diimine nickel(II) complexes bearing <i>ortho-sec</i>
-phenethyl groups for ethylene polymerization
作者:Fuzhou Wang、Jianchao Yuan、Fengying Song、Jing Li、Zong Jia、Bingnian Yuan
DOI:10.1002/aoc.2962
日期:2013.5
of new α‐diimine nickel(II) catalysts bearing bulky chiral sec‐phenethyl groups have been synthesized and characterized. The molecular structure of representative chiral ligand, bis[N,N′‐(4‐methyl‐2,6‐di‐sec‐phenethylphenyl)imino]‐1,2‐dimethylethane rac‐1c and chiral complexes, bis[N,N′‐(4‐methyl‐2‐sec‐phenethylphenyl)imino]‐2,3‐butadiene}dibromidonickel rac‐2a and bisbis[N,N′‐(4‐methyl‐2‐sec‐ph
合成并表征了一系列带有庞大手性仲苯乙基的新型α-二亚胺镍(II)催化剂。代表性手性配体的分子结构,双[ Ñ,Ñ ' - (4-甲基-2,6-二-仲丁基-phenethylphenyl)亚氨基] -1,2-二甲基乙烷外消旋-1c和手性络合物,双[ Ñ,N '-(4-甲基-2- sec-苯乙基苯基)亚氨基] -2,3-丁二烯}二溴代咪唑rac -2-a和bis bis [ N,N '-(4-甲基-2- sec-苯乙基苯基)亚氨基] -2,3-丁二烯} dibromidonickel外消旋‐2b由X射线晶体学分析确定。复杂的外消旋-2c轴承两个手性仲在苯乙基团邻位的芳基位置和甲基对-芳基的位置,由二乙基氯化铝(DEAC)激活时,显示出高的催化活性的用于乙烯[4.12×10的聚合6 g PE(mol Ni.h.bar)-1 ],并在低乙烯压力下(支化度分别为20、40和60°C / 1000