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Epoxides that are three-membered ring systems are more reactive than other cyclic and acyclic ethers. The high reactivity of epoxides originates from the strain present in the ring. This ring strain acts as a driving force for epoxides to undergo ring-opening reactions either with halogen acids or weak nucleophiles in the presence of mild acid. The acid catalyst converts the epoxide oxygen, a poor leaving group, into an oxonium ion, a better leaving group, making the reaction feasible. The...
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Due to their highly strained structures, epoxides can readily undergo ring-opening reactions through nucleophilic substitution, either in the presence of an acid or a base. The nucleophilic substitution reactions in the presence of acid are called acid-catalyzed ring-opening reactions, and nucleophilic substitution reactions in the presence of a base are called base-catalyzed ring-opening reactions. Epoxides undergo base-catalyzed ring-opening reactions in the presence of a strong nucleophile...
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Diols are compounds with two hydroxyl groups. In addition to syn dihydroxylation, diols can also be synthesized through the process of anti dihydroxylation. The process involves treating an alkene with a peroxycarboxylic acid to form an epoxide. Epoxides are highly strained three-membered rings with oxygen and two carbons occupying the corners of an equilateral triangle. This step is followed by ring-opening of the epoxide in the presence of an aqueous acid to give a trans diol.
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Enabling Controlled Synthesis of Poly(1,3-dioxolane) by Anion-Binding Catalytic Cationic Ring-Opening Polymerization.

Chenyang Guo1,2, Hongyu Li1,2, Maosheng Li1

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Chemically recyclable Poly(1,3-dioxolane) (PDXL) synthesis is now controlled using a novel anion-binding catalyst. This method precisely tunes molecular weights and yields hydroxyl-terminated PDXL for advanced material applications.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Organic Synthesis

Background:

  • Poly(1,3-dioxolane) (PDXL) is a promising thermoplastic with potential for chemical recycling.
  • Commercial application of PDXL is limited by challenges in controlling molecular weight and chain-end fidelity during synthesis.
  • Existing synthetic methods often struggle to achieve precise control over PDXL polymer architecture.

Purpose of the Study:

  • To develop a controlled cationic ring-opening polymerization (CROP) strategy for Poly(1,3-dioxolane) (PDXL).
  • To enable precise control over molecular weights and achieve high chain-end fidelity in PDXL synthesis.
  • To explore the use of anion-binding catalysis for reversible-deactivation CROP.

Main Methods:

  • Utilized a selenocyclodiphosph(V)azane catalyst for anion-binding catalysis.
  • Employed Me3SiX (X = I or OTf) initiators for initiating polymerization and masking chain ends.
  • Implemented counteranion engineering to modulate cationic species concentration and control polymerization outcomes.
  • Applied quenching strategies to convert masked chain ends to hydroxyl groups, ensuring telechelic fidelity.

Main Results:

  • Achieved controlled synthesis of Poly(1,3-dioxolane) (PDXL) under mild conditions via anion-binding catalytic CROP.
  • Demonstrated precise synthesis of low-molecular-weight (4.2-24.4 kDa) α,ω-dihydroxy telechelic PDXL using iodide as the counteranion.
  • Successfully synthesized high-molecular-weight (up to 562.0 kDa) PDXL using triflate as the counteranion with a proton trap.
  • Established a method for on-demand modulation of polymer molecular weight through counteranion selection.

Conclusions:

  • The developed anion-binding catalytic CROP strategy offers precise control over PDXL synthesis.
  • This approach overcomes previous limitations in controlling molecular weights and chain-end fidelity.
  • The ability to synthesize both low and high molecular weight telechelic PDXL opens new avenues for its application in chemically recyclable materials.