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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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Overview
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3-Methyl-ideneoxolane-2,5-dione.

Uwe Beginn1, Martin Frosinn, Martin Reichelt

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Summary

Itaconic anhydride, a cyclic organic compound, exhibits unique structural features due to ring closure. These distortions influence its molecular geometry and crystal packing through intermolecular interactions.

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Area of Science:

  • Organic Chemistry
  • Crystallography
  • Molecular Structure

Background:

  • Itaconic anhydride (C5H4O3) is a five-membered cyclic anhydride.
  • Understanding its structure is crucial for applications in polymer chemistry and organic synthesis.

Purpose of the Study:

  • To elucidate the detailed molecular and crystal structure of itaconic anhydride.
  • To analyze the impact of ring closure on bond lengths and angles compared to its open-chain counterpart, itaconic acid.

Main Methods:

  • X-ray crystallography was employed to determine the three-dimensional structure of itaconic anhydride in the crystalline state.
  • Analysis of bond lengths, bond angles, and intermolecular interactions (C-H⋯O).

Main Results:

  • Itaconic anhydride adopts a flat envelope conformation with three exocyclic double bonds.
  • Significant differences in bond angles were observed compared to itaconic acid, attributed to ring closure distortions.
  • Molecules are linked via C-H⋯O interactions, forming an extended three-dimensional crystal network.

Conclusions:

  • Ring closure in itaconic anhydride causes substantial distortions in bond angles, particularly at carbons involved in exocyclic double bonds.
  • The crystal structure is stabilized by a network of C-H⋯O hydrogen bonds.