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- W2564385404 abstract "The employment of a new asymmetric β-diketiminate ligand, N-(4-((2,6-diisopropyl-phenyl)imino)pent-2-en-2-yl)pyridin-2-amine (HL), in the organometallic chemistry of aluminium is reported. Reactions of HL with AlMe3, Et2AlCl and AlEtCl2, respectively, afforded [Al(L)Me2] (1), [Al(L)EtCl] (2) and [Al(L)Cl2] (3) in high yields. The structures of 1-3 were established by X-ray single-crystal diffraction. They were tested as the precursors for the ring opening polymerization (ROP) of e-caprolactone in the absence and presence of benzyl alcohol. Complexes 1 and 2 were found to catalyse the ROP of e-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 e-caprolactone. The catalytic behaviours of 1 and 2 are similar, while their catalytic performances exhibit marked difference with 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." @default.
- W2564385404 created "2017-01-06" @default.
- W2564385404 creator A5008389503 @default.
- W2564385404 creator A5017721204 @default.
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- W2564385404 creator A5032016127 @default.
- W2564385404 creator A5071037763 @default.
- W2564385404 creator A5091809789 @default.
- W2564385404 date "2017-03-10" @default.
- W2564385404 modified "2023-10-01" @default.
- W2564385404 title "Ring‐Opening Polymerization of ε‐Caprolactone Initiated by Aluminium Complexes Based on Pyridine‐Substituted Asymmetric β‐Diketiminate Ligands" @default.
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- W2564385404 doi "https://doi.org/10.1002/ejic.201601375" @default.