The coordination chemistry of a series of potentially tetra-, tri- and bi-dentate aminophenol pro-ligands ([L1]H–[L5]H) with magnesium and zinc derivatives has been studied. Reactions of the pro-ligands [L1]H, [L2]H and [L3]H with one equiv. of ZnEt2 or Zn(N(SiMe3)2)2 in toluene at room temperature afford cleanly, viaethane or amine elimination, the ethyl- and amido-zinc complexes 1–4. Complexes [L4]ZnEt (5) and [L4]Zn(N(SiMe3)2)2 (6) derived from the tridentate pro-ligand [L4]H were prepared in 84% and 76% yields, following similar alkane and amine elimination protocols, respectively. The 1 : 1 reactions of bidentate pro-ligand [L5]H with ZnEt2 or Zn(N(SiMe3)2)2 in toluene using different reaction protocols systematically yielded mixtures of the bis(ligand) complex [L5]2Zn (7) and the corresponding ethyl-[L5]ZnEt}n (8; n = 1 or 2) or amido- [L5]Zn(N(SiMe3)2)}n complexes (9; n = 1 or 2). The synthesis of magnesium-enolate complexes 10 and 11 was carried out in a one-pot, two-step procedure by first reacting pro-ligands [L1]H and [L4]H with one equiv. of Mg(n,sBu)2 to generate the corresponding [Ln]Mg(n,sBu)}n species, which were further reacted with one equiv. of 2,4,6-Me3C6H2COMe. All complexes have been characterized by multinuclear NMR, elemental analysis, and by single-crystal X-ray diffraction studies for five-coordinate magnesium complex 10, and four-coordinate Zn complexes 3–7. Preliminary studies indicate that magnesium species 10 and 11 as well as zinc complexes 1 and 5 are not active initiators for the polymerization of methyl methacrylate, even in combination with one equiv. of Li[OC(CH2)(2,4,6-Me3C6H2)], while zinc complexes 2, 4 and 6 are effective initiators for the ring-opening polymerization of ε-caprolactone and rac-lactide at 20 °C.
一系列潜在的四齿、三齿和二齿
氨基
酚前
配体([L1]H–[L5]H)与
镁和
锌衍
生物的配位
化学已被研究。前
配体[L1]H、[
L2]H和[L3]H与等量的ZnEt2或Zn(N(SiMe3)2)2在室温下在
甲苯中反应,通过
乙烷或胺消除,干净地得到乙基和酰胺基
锌配合物1–4。从三齿前
配体[L4]H衍生的配合物[L4]ZnEt(5)和[L4]Zn(N(SiMe3)2)2(6)分别通过类似的
烷烃和胺消除协议,以84%和76%的产率制备。二齿前
配体[L5]H与ZnEt2或Zn(N(SiMe3)2)2在
甲苯中的1:1反应,采用不同的反应协议,系统地生成了双(
配体)配合物[L5]2Zn(7)和相应的乙基-[L5]ZnEt}n(8; n = 1或2)或酰胺- [L5]Zn(N(SiMe3)2)}n配合物(9; n = 1或2)的混合物。
镁醇盐配合物10和11的合成采用了一锅法两步程序,首先将前
配体[L1]H和[L4]H与等量的Mg(n,sBu)2反应生成相应的[Ln]Mg(n,sBu)}n物种,然后进一步与等量的2,4,6-Me3C6H2COMe反应。所有配合物均通过多核NMR、元素分析以及五配位
镁配合物10和四配位
锌配合物3–6的单晶X射线衍射研究进行了表征。初步研究表明,
镁物种10和11以及
锌配合物1和5即使与等量的Li[OC(
CH2)(2,4,6-Me3C6H2)]结合,也不是
甲基丙烯酸甲酯聚合的有效
引发剂,而
锌配合物2, 4和6在20°C下对于
ε-己内酯和rac-
乳酸的环开聚合是有效的
引发剂。