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Topochemical transketalization reaction driven by hydrogen bonding.

Kana M Sureshan1, Tomohiro Murakami, Tomomi Miyasou

  • 1Department of Applied Chemistry, Faculty of Engineering, Ehime University, Matsuyama 790-0607, Japan. sureshankm@yahoo.co.in

Journal of the American Chemical Society
|July 30, 2004
PubMed
Summary

A solid-state thermal reaction unexpectedly transformed one myo-inositol derivative into another. This topochemical transketalization, driven by crystal structure and hydrogen bonding, offers new insights into solid-state chemistry.

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Area of Science:

  • Solid-state chemistry
  • Organic chemistry
  • Crystallography

Background:

  • Myo-inositol derivatives are important carbohydrates with diverse applications.
  • Understanding solid-state reactions is crucial for materials science and synthesis.
  • Ketal protection is a common strategy in carbohydrate chemistry.

Purpose of the Study:

  • To investigate an unusual thermal isomerization reaction of a myo-inositol derivative.
  • To elucidate the mechanism and driving forces behind the observed solid-state reaction.
  • To report the first instance of a topochemical transketalization reaction.

Main Methods:

  • Single-crystal X-ray diffraction to determine molecular and crystal structures.
  • Solid-state thermal analysis to study the isomerization process.
  • Computational modeling to understand reaction pathways and transition states (if applicable, though not explicitly stated in abstract).

Main Results:

  • Observed an unexpected thermal isomerization of 1,2;3,4-di-O-isopropylidene-myo-inositol to 1,2;5,6-di-O-isopropylidene-myo-inositol in the solid state.
  • Determined the reaction to be topochemically driven, meaning it is controlled by the arrangement of molecules in the crystal lattice.
  • Identified strong intermolecular hydrogen bonding as a key factor, preorganizing molecules for the ketal migration.

Conclusions:

  • The observed isomerization is a novel topochemical transketalization reaction.
  • Intermolecular hydrogen bonding in the crystal lattice facilitates the reaction by bringing reactive groups into proximity.
  • The crystal packing dictates the reaction pathway, highlighting the importance of solid-state structure in chemical transformations.