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Structure and Nomenclature of Epoxides02:38

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Cyclic ethers are heterocyclic compounds with an oxygen atom in the ring along with carbon atoms. They are named depending on the number of carbon atoms present in their ring system. Cyclic ethers with a three-membered ring system are called “oxirane”, four-membered ring systems as “oxetane”, five-membered ring systems as “oxolane”, and six-membered ring systems as “oxane”. The cyclic structure of these rings imposes angle strain, and this strain is more in the ring having a smaller number of...
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Macrocyclic and polymeric oxaziridine-derivatives.

Marcus Dickmeis1, Hakan Cinar, Helmut Ritter

  • 1Institut für Organische Chemie und Makromolekulare Chemie II, Heinrich-Heine-Universität Düsseldorf, Universitätsstrasse 1, 40225 Düsseldorf, Germany.

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Summary

New macrocyclic and polymeric imines were synthesized with excellent yields. Subsequent oxidation produced stable polyoxaziridines, with structure influenced by the diamine used in imine formation.

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Area of Science:

  • Polymer Chemistry
  • Organic Synthesis
  • Macromolecular Science

Background:

  • Template-free polycondensation offers a direct route to macrocyclic and polymeric imines.
  • The choice of diamine significantly influences the macrocyclization degree in imine synthesis.
  • Polyoxaziridines are valuable compounds with diverse applications, often derived from imine precursors.

Purpose of the Study:

  • To synthesize novel macrocyclic and polymeric imines using template-free polycondensation.
  • To investigate the effect of different diamines on the macrocyclization process.
  • To convert synthesized polyimines into polyoxaziridines and characterize their structures and stability.

Main Methods:

  • Template-free polycondensation of 1,6-bis(4-formylbenzoyloxy)hexane with specific diamines.
  • Matrix-assisted laser desorption-ionization time-of-flight (MALDI-TOF) mass spectrometry for structural analysis.
  • Gel permeation chromatography (GPC) for molecular weight determination.
  • Oxidation of polyimines using meta-chloroperoxybenzoic acid.

Main Results:

  • Macrocyclic and polymeric imines (5,5' and 6,6') were obtained in excellent yields.
  • The diamine structure critically affected macrocyclization, with 4,4'-methylene-bis(cyclohexylamine) yielding more macrocyclic products than bis(2-amino-2-methylprop-1-yl)adipate dihydrochloride.
  • Oxidation yielded polyoxaziridines (7,7' and 8,8') with controlled molecular weights and both macrocyclic and linear structures.
  • The synthesized polyoxaziridines demonstrated good stability and storability at room temperature.

Conclusions:

  • Template-free polycondensation is an effective method for synthesizing macrocyclic and polymeric imines.
  • Diamine selection is a key factor in controlling the macrocyclic content of the resulting imines.
  • The synthesized polyoxaziridines are stable and accessible through a straightforward oxidation process, opening avenues for further material development.