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Ring-Opening Polymerization of epsilon-Caprolactone Initiated by Aluminium Complexes Based on Pyridine-Substituted Asymmetric beta-Diketiminate Ligands
Lu, Ning1; Jiang, Zhilei1; Pei, Hao1; Liu, Wei1; Li, Yahong1; Dong, Yaping2
2017-03-10
Source PublicationEUROPEAN JOURNAL OF INORGANIC CHEMISTRY
Issue10Pages:1320-1327
SubtypeArticle
AbstractThe use of a new asymmetric beta-diketiminate ligand, N-{4-[(2,6-diisopropyl-phenyl) imino] pent-2-en-2-yl} pyridin-2amine (HL), in the organometallic chemistry of aluminium is reported. Reactions of HL with AlMe3, Et2AlCl, and AlEtCl2, respectively, afforded [Al(L)Me-2] (1), [Al(L) EtCl] (2), and [Al(L) Cl-2] (3) in high yields. The structures of 1-3 were established by singlecrystal X-ray diffraction. They were tested as precursors in the ring-opening polymerization (ROP) of epsilon-caprolactone in the absence and presence of benzyl alcohol. Complexes 1 and 2 were found to catalyze the ROP of epsilon-caprolactone with moderate activities in the absence of benzyl alcohol, and complex 3 showed low activity in the absence of benzyl alcohol. Upon addition of one equivalent of benzyl alcohol, all complexes were efficient initiators for the ROP of epsilon-caprolactone. The catalytic behaviors of 1 and 2 are similar, whereas their catalytic performances exhibit a marked difference to that of 3. MALDI-TOF-MS studies for the end group analysis were conducted. The results revealed that chain-like oligomers with benzyl alcohol as the terminal group were formed by using 1 as the initiator, whereas cyclic oligomers were the main products for the polymerization reactions initiated by 3. These results give mechanistic insights into the polymerization reactions initiated by 1 and 3.
KeywordAluminum Asymmetric Synthesis Beta-diketiminate Lactones Ring-opening Polymerization
WOS HeadingsScience & Technology ; Physical Sciences
WOS KeywordDRUG-DELIVERY SYSTEMS ; L-LACTIDE ; SCHIFF-BASE ; ZINC-COMPLEXES ; CYCLIC ESTERS ; RAC-LACTIDE ; STEREOSELECTIVE POLYMERIZATION ; LIVING POLYMERIZATION ; KETIMINATE COMPLEXES ; EFFICIENT CATALYSTS
Indexed BySCI
Language英语
WOS Research AreaChemistry
WOS SubjectChemistry, Inorganic & Nuclear
WOS IDWOS:000397851900003
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.isl.ac.cn/handle/363002/6199
Collection青海盐湖研究所知识仓储
盐湖资源综合利用工程技术中心
Affiliation1.Soochow Univ, Coll Chem Chem Engn & Mat Sci, Suzhou 215123, Peoples R China
2.Chinese Acad Sci, Qinghai Inst Salt Lakes, Key Lab Salt Lake Resources & Chem, Xining 810008, Peoples R China
Recommended Citation
GB/T 7714
Lu, Ning,Jiang, Zhilei,Pei, Hao,et al. Ring-Opening Polymerization of epsilon-Caprolactone Initiated by Aluminium Complexes Based on Pyridine-Substituted Asymmetric beta-Diketiminate Ligands[J]. EUROPEAN JOURNAL OF INORGANIC CHEMISTRY,2017(10):1320-1327.
APA Lu, Ning,Jiang, Zhilei,Pei, Hao,Liu, Wei,Li, Yahong,&Dong, Yaping.(2017).Ring-Opening Polymerization of epsilon-Caprolactone Initiated by Aluminium Complexes Based on Pyridine-Substituted Asymmetric beta-Diketiminate Ligands.EUROPEAN JOURNAL OF INORGANIC CHEMISTRY(10),1320-1327.
MLA Lu, Ning,et al."Ring-Opening Polymerization of epsilon-Caprolactone Initiated by Aluminium Complexes Based on Pyridine-Substituted Asymmetric beta-Diketiminate Ligands".EUROPEAN JOURNAL OF INORGANIC CHEMISTRY .10(2017):1320-1327.
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