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Updated: Jun 4, 2026

Controlled Photoredox Ring-Opening Polymerization of O-Carboxyanhydrides Mediated by Ni/Zn Complexes

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Published on: November 21, 2017

Stereoselective Ring-Opening Polymerization of Racemic Dithiolactones Assisted by Non-Classical C─H⋯X Interactions.

Yanchao Wang¹, Chenyang Guo¹, Xue Wang¹

¹State Key Laboratory of Polymer Science and Technology, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, P.R. China.

Angewandte Chemie (International Ed. in English)

|June 3, 2026

Summary

This study introduces a novel catalytic system for ultrafast, stereoselective polymerization of recyclable dithiolactones. The method yields high-performance, stereoregular polythioesters with enhanced thermal properties and mechanical strength.

Keywords:

chemically recyclable non‐classical hydrogen bonding polythioesters ring‐opening polymerization stereoselective polymerization

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Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers

Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers

Published on: June 20, 2019

Area of Science:

Polymer Chemistry
Catalysis
Materials Science

Background:

Stereoselective polymerization is crucial for high-performance recyclable polymers.
Achieving rapid, controlled, and stereoselective chain growth in polymerization remains a significant challenge.

Purpose of the Study:

To develop a catalytic system for highly stereoselective ring-opening polymerization.
To synthesize stereoregular, chemically recyclable polythioesters with enhanced properties.

Main Methods:

Utilized a catalytic system based on non-classical C─H⋯X hydrogen-bonding interactions.
Employed a bulky quaternary ammonium cation to create a confined environment for monomer and chain end orientation.
Performed ultrafast and stereoselective ring-opening polymerization of rac-dithiolactones in dichloromethane (DCM).

Main Results:

Achieved highly stereoselective ring opening, yielding stereoregular polythioesters (P_m up to 0.97, M_n up to 225.6 kDa).
The synthesized polythioesters are fully recyclable and form stereocomplexes, boosting the melting temperature (T_m) from 120.1°C to 224.1°C.
The polymers exhibit polyolefin-like mechanical performance.

Conclusions:

Non-classical hydrogen-bonding interactions play a key role in stereocontrol during polymerization.
The developed catalytic system provides a robust route to stereoregular, chemically recyclable polythioesters with superior thermal and mechanical properties.