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Dialkylaluminium 2-imidazolylphenolates: Synthesis, characterization and ring-opening polymerization behavior towards lactides

Zhang, Wenjuan; Wang, Youhong; Wang, Lin; Redshaw, Carl; Sun, Wen-Hua


Wenjuan Zhang

Youhong Wang

Lin Wang

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Professor Carl Redshaw
Professor of Inorganic Materials Chemistry and REF Lead for Chemistry

Wen-Hua Sun


The stoichiometric reaction of the 2-imidazolylphenols (L1–L9) with the trialkylaluminium reagents AlR₃ (R = Me, Et and iBu), afforded the corresponding dialkylaluminium 2-imidazolylphenolate complexes [R₂Al(L1–L9)] (C1–C11), which were characterized by ¹H/¹³C NMR spectroscopy and by elemental analysis. The molecular structures of the representative complexes C1, C2, C4, C6 and C11 were determined by single-crystal X-Ray diffraction, and revealed a distorted tetrahedral geometry at aluminum. These dialkylaluminium 2-imidazolylphenolates (C1–C11) could efficiently catalyze the ring-opening polymerization of lactides to afford high molecular weight polylactide, both in the presence and absence of BnOH, and as such represent rare examples of the use of bi-dentate ligation at aluminum in such lactide polymerization systems. On the basis of the polymerization results for l-lactide, d-lactide and rac-lactide, the nature of the ligands and the aluminum bound alkyls were found to significantly affect the catalytic activity as well as the properties of the resultant polylactides.


Zhang, W., Wang, Y., Wang, L., Redshaw, C., & Sun, W. (2014). Dialkylaluminium 2-imidazolylphenolates: Synthesis, characterization and ring-opening polymerization behavior towards lactides. Journal of organometallic chemistry, 750(January), 65-73.

Journal Article Type Article
Acceptance Date Nov 4, 2013
Online Publication Date Nov 12, 2013
Publication Date 2014-02
Deposit Date Jun 10, 2015
Publicly Available Date Jun 10, 2015
Journal Journal of organometallic chemistry
Print ISSN 0022-328X
Electronic ISSN 0022-328X
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 750
Issue January
Pages 65-73
Keywords Ring-opening polymerization; Polylactide; Aluminum 2-imidazolylphenolate
Public URL
Publisher URL
Additional Information Author's accepted manuscript of article published in: Journal of organometallic chemistry, 2014, v.750, January.


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© 2014, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International

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