Controlled ring-opening polymerization ofl-lactide and ε-caprolactone catalyzed by aluminum-based Lewis pairs or Lewis acid alone

2016 ◽  
Vol 55 (2) ◽  
pp. 297-303 ◽  
Author(s):  
Yuushou Nakayama ◽  
Shunsuke Kosaka ◽  
Kentaro Yamaguchi ◽  
Gentaro Yamazaki ◽  
Ryo Tanaka ◽  
...  
Keyword(s):  
Lewis Acid ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Lewis Pairs

Controlled ring-opening polymerization of α-amino acid N-carboxy-anhydride by frustrated amine/borane Lewis pairs

2017 ◽  
Vol 53 (37) ◽  
pp. 5155-5158 ◽  
Author(s):  
Hongyuan Zhang ◽  
Yanzhao Nie ◽  
Xinmei Zhi ◽  
Haifeng Du ◽  
Jing Yang
Keyword(s):  
Amino Acid ◽  
Lewis Acid ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Amine Groups ◽  
Lewis Pairs

An FLP intermediate formed through the bulky borane Lewis acid and the amine groups of the propagation chain end controlled the ring-opening polymerization of α-amino acid N-carboxy-anhydride monomers.

Insights into the mechanism for ring-opening polymerization of lactide catalyzed by Zn(C6F5)2/organic superbase Lewis pairs

2016 ◽  
Vol 6 (21) ◽  
pp. 7763-7772 ◽  
Author(s):  
Xiao-Qing Li ◽  
Bin Wang ◽  
He-Yuan Ji ◽  
Yue-Sheng Li
Keyword(s):  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Experimental Results ◽  
Maldi Tof Ms ◽  
Maldi Tof ◽  
Good Consistency ◽  
Plausible Mechanism ◽  
Tof Ms ◽  
Lewis Pairs

A plausible mechanism for ring-opening polymerization of lactide catalyzed by Zn(C6F5)2-based Lewis pairs was proposed based on in situ NMR and MALDI-TOF MS analyses. Several experimental results show very good consistency with the proposed mechanism.

A new route for the preparation of enriched iso-polylactide from rac-lactide via a Lewis acid catalyzed ring-opening of an epoxide

2017 ◽  
Vol 46 (18) ◽  
pp. 5938-5945 ◽  
Author(s):  
Mathew Anker ◽  
Choumini Balasanthiran ◽  
Vagulejan Balasanthiran ◽  
Malcolm H. Chisholm ◽  
Savithra Jayaraj ◽  
...  
Keyword(s):  
Lewis Acid ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Selective Ring Opening ◽  
Acid Catalyzed

Al(iii) acts as a Lewis acid for the ring-opening of an epoxide by Cl− attack and this yields stereo selective ring-opening polymerization of rac-lactide to yield iso-polylactide.

scholarly journals The crucial roles of guest water in a biocompatible coordination network in the catalytic ring-opening polymerization of cyclic esters: a new mechanistic perspective

2020 ◽  
Vol 11 (12) ◽  
pp. 3345-3354 ◽  
Author(s):  
Sheng-Chun Chen ◽  
Fei-Hang Zhang ◽  
Kun-Lin Huang ◽  
Feng Tian ◽  
Zhi-Hui Zhang ◽  
...  
Keyword(s):  
Lewis Acid ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Cyclic Esters ◽  
Polymerization Mechanism ◽  
Synergistic Catalysis ◽  
Coordination Network ◽  
Coordination Framework ◽  
Acid Centers ◽  
Brønsted And Lewis Acid

A new ring-opening polymerization mechanism is unveiled based on synergistic catalysis involving Brønsted and Lewis acid centers in a coordination framework.

Simple Lewis pairs of zinc salts and organobases as bifunctional catalysts for controlled ring-opening polymerization of O-carboxyanhydrides

2019 ◽  
Vol 10 (40) ◽  
pp. 5498-5506 ◽  
Author(s):  
Pei Wang ◽  
Jinpeng Liang ◽  
Ting Yin ◽  
Jing Yang
Keyword(s):  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Bifunctional Catalysis ◽  
Bifunctional Catalysts ◽  
Hydroxyalkanoic Acid ◽  
Zinc Salts ◽  
Lewis Pairs

Simple Lewis pairs consisting of organobases and zinc salts were explored to promote ring-opening polymerization of phenyl O-carboxyanhydride via bifunctional catalysis, producing well-defined poly(α-hydroxyalkanoic acid)s with good isotacticity (Pm = 0.88).

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