Synthesis and Characterization of Dialkylaluminum Amidates and Their Ring-Opening Polymerization of ε-Caprolactone

Zhang, Wenjuan, Wang, Youhong, Cao, Ji, Wang, Lin, Pan, Yi, Redshaw, Carl and Sun, Wen-Hua (2011) Synthesis and Characterization of Dialkylaluminum Amidates and Their Ring-Opening Polymerization of ε-Caprolactone. Organometallics, 30 (22). pp. 6253-6261. ISSN 0276-7333

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Abstract

The stoichiometric reactions of N-(2-methylquinolin-8-yl) (R)amides (L1–L8; L1, R = Ph; L2, R = p-FPh; L3, R = p-ClPh; L4, R = p-(MeO)Ph; L5, R = o-MePh; L6, R = p-MePh; L7, R = Me; L8, R = CF3) with Me3Al afforded the corresponding dimethylaluminum amidate complexes [Me2AlL] (C1–C8). The treatment of N-(2-methylquinolin-8-yl)picolinamide (L9) with 1 or 2 equiv of Me3Al formed Me2AlL9 (C9) or Me2AlL9·Me3Al (C10), respectively; meanwhile, the stoichiometric reaction of L9 with iBu3Al gave iBu2AlL9 (C11). All organoaluminum amidate complexes were fully characterized by 1H/13C NMR spectroscopy and elemental analysis, and the unambiguous structures of complexes C2, C4, C9, and C11 were further determined by single-crystal X-ray diffraction. With the assistance of 1 equiv of BnOH, all dialkylaluminum amidate complexes showed appreciable activities toward the ring-opening polymerization of e-caprolactone and produced polycaprolactones with narrow polydispersity; the nature of the active species was also investigated.

Item Type: Article
Faculty \ School: Faculty of Science > School of Chemistry
Depositing User: Rhiannon Harvey
Date Deposited: 21 Mar 2012 11:37
Last Modified: 17 Mar 2020 14:45
URI: https://ueaeprints.uea.ac.uk/id/eprint/38382
DOI: 10.1021/om2008343

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