Methylaluminium 8-quinolinolates: Synthesis, characterization and use in ring-opening polymerization (ROP) of ε-caprolactone

Sun, Wen Hua; Shen, Miao; Zhang, Wenjuan; Huang, Wei; Liu, Shaofeng; Redshaw, Carl

Abstract

The stoichiometric reactions of 2-(2,6-R-phenylimino)quinolin-8-ol (L1-L5, L1: R = Me, L2: R = Et, L3: R = iPr, L4: R = Cl, L5: R = F) with Me3Al afforded the dimeric aluminium complexes [Me 2AlL]2 (1-5) in good yields. By contrast, stoichiometric reactions of 2-(1-(2,6-R-phenylimino)propyl) quinolin-8-ol (L6-L10, L6: R = Me, L7: R = Et, L8: R = iPr, L9: R = Cl, L10: R = F)) with Me 3Al gave the mononuclear aluminium complexes Me2AlL (6-10) accompanied with by-products of the form Me2AlL·Me 3Al (11-15). All methylaluminium complexes were characterized by NMR spectroscopy, elemental analysis, and the molecular structures of complexes 3, 6 and 8 were determined by single-crystal X-ray diffraction. Aluminium compounds 1-5 possessed negligible activity towards the ring-opening polymerization of ε-caprolactone either in the presence or absence of BnOH. In contrast, in the presence of BnOH, the mononuclear aluminium compounds 6-10 could efficiently initiate the ring-opening polymerization of ε-caprolactone; the polymerization proceeded in a living manner. © 2011 The Royal Society of Chemistry.

Citation

Sun, W. H., Shen, M., Zhang, W., Huang, W., Liu, S., & Redshaw, C. (2011). Methylaluminium 8-quinolinolates: Synthesis, characterization and use in ring-opening polymerization (ROP) of ε-caprolactone. Dalton Transactions : an international journal of inorganic chemistry, 40(11), 2645-2653. https://doi.org/10.1039/c0dt01207f

• Journal Article Type: Article
• Acceptance Date: Dec 23, 2010
• Online Publication Date: Feb 4, 2011
• Publication Date: Mar 21, 2011
• Deposit Date: Jun 8, 2022
• Journal: Dalton Transactions
• Print ISSN: 1477-9226
• Electronic ISSN: 1477-9234
• Publisher: Royal Society of Chemistry
• Peer Reviewed: Peer Reviewed
• Volume: 40
• Issue: 11
• Pages: 2645-2653
• DOI: https://doi.org/10.1039/c0dt01207f
• Public URL: https://hull-repository.worktribe.com/output/3622461