JOURNAL OF CHILEAN CHEMICAL SOCIETY

Vol 62 No 2 (2017): Journal of the Chilean Chemical Society
Original Research Papers

AN ALUMINUM SILOXIDE COMPLEX FOR STEREOSELECTIVE POLYMERIZATION OF RACEMIC LACTIDE

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  • Yu Zhang,
  • Xuan Pang,
  • Lili Ma,
  • Zhaohui Tang
Yu Zhang
Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences University of Chinese Academy of Sciences
Xuan Pang
Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences
Lili Ma
Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences University of Chinese Academy of Sciences
Zhaohui Tang
Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences
Published June 16, 2017
Keywords
  • Aluminum siloxide,
  • Catalyst,
  • Lactide,
  • Stereoselective,
  • Polymerization
How to Cite
Zhang, Y., Pang, X., Ma, L., & Tang, Z. (2017). AN ALUMINUM SILOXIDE COMPLEX FOR STEREOSELECTIVE POLYMERIZATION OF RACEMIC LACTIDE. Journal of the Chilean Chemical Society, 62(2). Retrieved from https://www.jcchems.com/index.php/JCCHEMS/article/view/187

Copyright (c) 2017 Yu Zhang, Xuan Pang, Lili Ma, Zhaohui Tang

Creative Commons License

This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

Abstract

Stereoselective polymerization of lactide is receiving growing attention in polymer science. Herein, a five-coordinate aluminum siloxide complex, [2,2-dimethyl- 1,3-propylenebis(3,5-di-tert- butylsalicylideneiminato)] (triphenyl-silanolato) aluminium (III) (1), was prepared from AlEt3, N,N´-(2,2-dimethylpropylene) bis(3,5-di-tert-butylsalicylideneimine) and triphenyl-silanol. X-ray analysis demonstrated that 1 contained a five-coordinate aluminum atom with distorted trigonal bipyramidal geometry in the solid state. 1H NMR and 13C NMR spectra indicated that the two conformational stereoisomers of 1 tautomerizes rapidly in chloroform or toluene solution at room temperature. 1 showed high stereoselectivity (Pm = 0.84) for the ROP of rac-lactide in toluene at 100°C, and polymerized rac-lactide to crystalline polymer (Tm = 178°C). This is the first report of stereoselective polymerization of rac-lactide using aluminum siloxide as a catalyst.

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