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Topochemical Alkyne Nitrile Oxide Cycloaddition for Polymer Synthesis.

Rahul Singh1, Anjana Siddharthan1, Kana M Sureshan1

  • 1School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram, Thiruvananthapuram, 695551, India.

Angewandte Chemie (International Ed. in English)
|November 3, 2025
PubMed
Summary

Researchers developed a novel topochemical alkyne nitrile oxide cycloaddition (TANOC) reaction. This solvent-free method spontaneously creates isoxazole-linked polymers from crystalline monomers at room temperature.

Keywords:
Click chemistryIsoxazoleNitrile oxideSingle‐crystal‐to‐single‐crystalTopochemical polymerization

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Area of Science:

  • Polymer Chemistry
  • Organic Synthesis
  • Materials Science

Background:

  • Topochemical reactions offer solvent-free, catalyst-free polymer synthesis.
  • Novel solid-state reactions are needed to expand polymer design.
  • Nitrile oxides are reactive, posing challenges for stable monomer design.

Purpose of the Study:

  • To report the first topochemical alkyne nitrile oxide cycloaddition (TANOC) reaction.
  • To demonstrate the synthesis of isoxazole-linked polymers via a solid-state [3+2] cycloaddition.
  • To develop a stable, crystallizable monomer for topochemical polymerization.

Main Methods:

  • Single-crystal X-ray diffraction for structural analysis of monomer and polymer.
  • Spectroscopic studies (e.g., NMR, IR) to confirm polymer structure.
  • Kinetic studies to understand reaction mechanism and rate.

Main Results:

  • Successful implementation of the first topochemical alkyne nitrile oxide cycloaddition (TANOC).
  • Formation of an isoxazole-backbone polymer directly from a crystalline monomer at room temperature.
  • Demonstration of spontaneous, regiospecific [3+2] cycloaddition driven by crystal lattice packing.

Conclusions:

  • The TANOC reaction provides a new route for solid-state polymer synthesis.
  • Steric protection of nitrile oxides enables stable monomer crystallization and reaction.
  • The isoxazole linkages offer potential for further functionalization, expanding material applications.