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Chiral phosphoric acid catalyzed asymmetric kinetic resolution polymerization of 6-aryl-ε-caprolactones

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Abstract

An asymmetric kinetic resolution polymerization (AKRP) of 6-aryl-ε-caprolactones has been developed. As bifunctional organocatalysts, chiral phosphoric acids promoted the synthesis of stereogradient polycaprolactones (PCLs) with controlled molecular weights and narrow molecular weight distribution. The highest enantioselectivity factor was up to 4.1 for the polymerization of 6-p-Cl-C6H4-CL using CPA-3 as an organocatalyst at 44% conversion, indicating that an enantiomorphic site control mechanism was involved. A phenomenon of chirality reduction was observed during the polymerization process, and a mismatch of chiral induction and chain steric hindrance has been proposed.

Graphical abstract: Chiral phosphoric acid catalyzed asymmetric kinetic resolution polymerization of 6-aryl-ε-caprolactones

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Article information


Submitted
08 Apr 2020
Accepted
10 Jun 2020
First published
11 Jun 2020

Polym. Chem., 2020, Advance Article
Article type
Communication

Chiral phosphoric acid catalyzed asymmetric kinetic resolution polymerization of 6-aryl-ε-caprolactones

C. Lv, G. Xu, R. Yang, L. Zhou and Q. Wang, Polym. Chem., 2020, Advance Article , DOI: 10.1039/D0PY00514B

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