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Polymers 2017, 9(3), 83; doi:10.3390/polym9030083

Synthesis of Aluminum Complexes Bearing 8-Anilide-5,6,7-trihydroquinoline Ligands: Highly Active Catalyst Precursors for Ring-Opening Polymerization of Cyclic Esters

1
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, Shanghai 201620, China
2
School of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
3
Department of Chemistry and Engineering, Central South University, Changsha 410083, China
4
Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
*
Authors to whom correspondence should be addressed.
Academic Editor: Zhibin Ye
Received: 6 February 2017 / Revised: 24 February 2017 / Accepted: 25 February 2017 / Published: 1 March 2017
(This article belongs to the Special Issue Tailored Polymer Synthesis by Advanced Polymerization Techniques)
View Full-Text   |   Download PDF [1459 KB, uploaded 1 March 2017]   |  

Abstract

The stoichiometric reactions of 8-(2,6-R1-4-R2-anilide)-5,6,7-trihydroquinoline (LH) with AlR3 (R = Me or Et) afforded the aluminum complexes LAlR2 (Al1Al5,Al1: R1 = iPr, R2 = H, R = Me; Al2: R1 = Me, R2 = H, R = Me; Al3: R1 = H, R2 = H, R = Me; Al4: R1 = Me, R2 = Me, R = Me; Al5: R1 = Me, R2 = Me, R = Et) in high yields. All aluminum complexes were characterized by NMR spectroscopy and elemental analysis. The molecular structures of complexes Al4 and Al5 were determined by single-crystal X-ray diffractions and revealed a distorted tetrahedral geometry at aluminum. In the presence of BnOH, complexes Al1Al5 efficiently initiated the ring-opening homopolymerization of ε-caprolactone (ε-CL) and rac-lactide (rac-LA), respectively, in a living/controlled manner. View Full-Text
Keywords: aluminum complexes; crystal structures; ring-opening polymerization; biodegradable polyesters aluminum complexes; crystal structures; ring-opening polymerization; biodegradable polyesters
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Liu, S.; Zhang, J.; Zuo, W.; Zhang, W.; Sun, W.-H.; Ye, H.; Li, Z. Synthesis of Aluminum Complexes Bearing 8-Anilide-5,6,7-trihydroquinoline Ligands: Highly Active Catalyst Precursors for Ring-Opening Polymerization of Cyclic Esters. Polymers 2017, 9, 83.

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