Structural and catalytic studies of zinc complexes containing amido-oxazolinate ligands
作者:Ming-Tsz Chen、Chi-Tien Chen
DOI:10.1039/c1dt10974j
日期:——
Several zinc complexes bearing amido-oxazolinate ligands are described. Reactions of ligand precursors, HNC2EOxa (HNC2EOxa = HNC2MeOxa, HNC2OMeOxa, HNC2StBuOxa and HNC2NMe2Oxa) or HNPhSMeOxa, with half or one molar equivalent of ZnEt2 afford bis(chelate) zinc complexes, (NC2EOxa)2Zn [C2E = propyl, (1); C2E = 2-methoxyethyl, (2); C2E = 2-N,N′-dimethylethyl, (3)] or zinc ethyl complexes, (NC2StBuOxa)ZnEt(4) and (NPhSMeOxa)ZnEt(5), using tetrahydrofuran or hexane as solvents. The zinc benzyl oxide complexes, [(NC2EOxa)Zn(μ-OBn)]2 [C2E = propyl, (6); C2E = 2-methoxyethyl, (7); C2E = 2-tert-butylthioethyl, (8)], are obtained from the reactions of ligand precursors, HNC2EOxa, with one molar equivalent of ZnEt(OBn) (generated in situ on 1 : 1 ratio of ZnEt2 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.
本文描述了若干带有氨基-恶唑啉配体的锌配合物。配体前体HNC2EOxa(HNC2EOxa = HNC2MeOxa、HNC2OMeOxa、HNC2StBuOxa和HNC2NMe2Oxa)或HNPhSMeOxa与半摩尔或一摩尔等量的ZnEt2反应,在四氢呋喃或己烷作为溶剂的情况下,可生成双(螯合)锌配合物(NC2EOxa)2Zn [C2E = 丙基,(1);C2E = 2-甲氧基乙基,(2);C2E = 2-N,N′-二甲基乙基,(3)]或乙基锌配合物(NC2StBuOxa)ZnEt(4)和(NPhSMeOxa)ZnEt(5)。锌苄基氧化物配合物((NC2EOxa)Zn(μ-OBn))2 [C2E = 丙基,(6);C2E = 2-甲氧基乙基,(7);C2E = 2-叔丁基硫代乙基,(8)]由配体前体HNC2EOxa与一摩尔等量的ZnEt(OBn)(在四氢呋喃中以ZnEt2和