hafnium amide (L6)Hf(NMe2)(Cl)(THF) (18), respectively. Complexes 7–19 were characterized by various spectroscopic techniques and elemental analyses. The molecular structures of 10 and 14–19 were also established by X-ray diffraction analyses, which represent the first example of the structurally characterized group 4 chiral NHC–metal complex. Furthermore, 7–19 are active catalysts for the polymerization
通过从M(NR 2)4(M = Ti,Zr,Hf; R = Me,Et)和手性钳型NHC
配体L4(L4a和L4b)中去除胺可以制备高收率的手性4族NHC-
金属配合物,L 5和L 6衍生自(S,S)
-二苯基-1,2-
乙二胺。用1当量处理M(NR 2)4 在苯溶液中重结晶后,L4在THF中的手性得到手性
钛酰胺(L4)Ti(NMe 2)(Br)(THF)(7)和(L4)Ti(NMe 2))(Cl)(THF)(11),酰胺
锆(L4)Zr(NMe 2)(Br)(THF)(8),(L4)Zr(NEt 2)(Br)(THF)(10),(L4)Zr(NMe 2)(Cl)(THF)(12)和(L4)Zr(NEt 2)(Cl)(THF)(14)和ha酰胺(L4)Hf(NMe 2)(Br)( THF)(9)和(L4)Hf(NMe 2)(Cl)(THF)(13)。类似地,L5或L6与1当量的反应。的M(NR2) 4生成
钛酰胺(