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The anomeric effect in heterocycles is driven by orbital interactions and electrostatics, not just sterics. This key finding clarifies the origins of axial preference for electronegative substituents.

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Area of Science:

  • Computational Chemistry
  • Organic Chemistry
  • Molecular Interactions

Background:

  • The anomeric effect, a conformational preference in cyclic molecules, arises from complex interactions.
  • Its precise energetic contributions (steric, electrostatic, orbital) remain a subject of debate.

Purpose of the Study:

  • To computationally investigate the origins of the anomeric effect in substituted cyclohexanes, tetrahydropyrans, and thianes.
  • To differentiate the roles of steric, electrostatic, and orbital interactions in determining conformational preferences.

Main Methods:

  • Systematic computational study of substituted cyclic systems (YCH3, CF3, F, Cl).
  • Conformational energy evaluation in gas phase and implicit water.
  • Natural Bond Orbital (NBO) analysis to decompose interaction types.

Main Results:

  • Heterocycles (oxygen, sulfur) show axial stabilization for electronegative groups, unlike cyclohexanes.
  • Stabilization is primarily due to nX → σ*CY hyperconjugation and favorable electrostatics.
  • Steric effects modulate but do not dominate the anomeric effect.

Conclusions:

  • The anomeric effect in heterocycles is significantly influenced by orbital delocalization and electrostatics.
  • These intramolecular interactions persist even in polar solvents.
  • The study clarifies the energetic balance governing the anomeric effect.