Department of Chemistry, National Chung Hsing University, Taichung 402, Taiwan, Republic of China.
Dalton Trans. 2011 Dec 28;40(48):12886-94. doi: 10.1039/c1dt10974j. Epub 2011 Oct 27.
Several zinc complexes bearing amido-oxazolinate ligands are described. Reactions of ligand precursors, HNC(2)(E)Oxa (HNC(2)(E)Oxa = HNC(2)(Me)Oxa, HNC(2)(OMe)Oxa, HNC(2)(StBu)Oxa and HNC(2)(NMe2)Oxa) or HNPh(SMe)Oxa, with half or one molar equivalent of ZnEt(2) afford bis(chelate) zinc complexes, (NC(2)(E)Oxa)(2)Zn [C(2)(E) = propyl, (1); C(2)(E) = 2-methoxyethyl, (2); C(2)(E) = 2-N,N'-dimethylethyl, (3)] or zinc ethyl complexes, (NC(2)(StBu)Oxa)ZnEt(4) and (NPh(SMe)Oxa)ZnEt(5), using tetrahydrofuran or hexane as solvents. The zinc benzyl oxide complexes, (NC(2)(E)Oxa)Zn(μ-OBn) [C(2)(E) = propyl, (6); C(2)(E) = 2-methoxyethyl, (7); C(2)(E) = 2-tert-butylthioethyl, (8)], are obtained from the reactions of ligand precursors, HNC(2)(E)Oxa, with one molar equivalent of ZnEt(OBn) (generated in situ on 1:1 ratio of ZnEt(2) and BnOH) in tetrahydrofuran. The molecular structures are reported for compounds 1, 3, 5, 6 and 7. All eight compounds were assessed as efficient catalyst precursors towards the ring-opening polymerization of L-lactide and ε-caprolactone.
描述了几种含有酰胺基-恶唑啉配体的锌配合物。配体前体 HNC(2)(E)Oxa（HNC(2)(E)Oxa = HNC(2)(Me)Oxa、HNC(2)(OMe)Oxa、HNC(2)(StBu)Oxa 和 HNC(2)(NMe2)Oxa）或 HNPh(SMe)Oxa 与 ZnEt(2)的半摩尔或一摩尔当量反应，得到双（螯合）锌配合物(NC(2)(E)Oxa)(2)Zn [C(2)(E) = 丙基，(1)；C(2)(E) = 2-甲氧基乙基，(2)；C(2)(E) = 2-N,N'-二甲乙基，(3)]或锌乙基配合物(NC(2)(StBu)Oxa)ZnEt(4)和(NPh(SMe)Oxa)ZnEt(5)，使用四氢呋喃或正己烷作为溶剂。锌苄基氧化物配合物(NC(2)(E)Oxa)Zn(μ-OBn) [C(2)(E) = 丙基，(6)；C(2)(E) = 2-甲氧基乙基，(7)；C(2)(E) = 2-叔丁基硫代乙基，(8)]是由配体前体 HNC(2)(E)Oxa 与 ZnEt(OBn)的摩尔当量反应得到的，ZnEt(OBn)是在 ZnEt(2)和 BnOH 的 1:1 比例下原位生成的，反应在四氢呋喃中进行。化合物 1、3、5、6 和 7 的分子结构均已报道。所有这 8 种化合物均被评估为 L-丙交酯和 ε-己内酯开环聚合的有效催化剂前体。
