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2-Formylbenzonitrile.

Doyle Britton1, Christopher J Cramer

  • 1Department of Chemistry, University of Minnesota, Minneapolis, MN 55455-0431, USA. britton@chem.umn.edu

Acta Crystallographica. Section C, Crystal Structure Communications
|June 10, 2006
PubMed
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This study reveals weak intramolecular nucleophilic attack in 2-formylbenzonitrile, supported by computational analysis. Molecular interactions, including hydrogen bonds, influence crystal packing in this organic compound.

Area of Science:

  • Organic Chemistry
  • Computational Chemistry
  • Crystallography

Background:

  • 2-formylbenzonitrile (C8H5NO) exhibits unique structural features.
  • Intramolecular interactions can significantly influence molecular properties and reactivity.

Purpose of the Study:

  • To investigate the nature of the intramolecular O...CN contact in 2-formylbenzonitrile.
  • To elucidate the electronic and structural factors governing this interaction using computational methods.
  • To understand the intermolecular forces driving crystal packing.

Main Methods:

  • X-ray crystallography to determine molecular structure and packing.
  • Density functional theory (DFT) calculations, specifically B3LYP/6-31G*, to model electronic structure.
  • Natural Bond Orbital (NBO) analysis to quantify delocalization energies.

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Main Results:

  • An intramolecular O...C distance of 2.797 Å and a C-C-N bond angle of 174.5° suggest weak nucleophilic attack by the aldehyde oxygen on the nitrile carbon.
  • Computational analysis confirmed this interaction, with a calculated delocalization energy of 6.3 kJ mol⁻¹.
  • Hydrogen bonds (C-H...N and C-H...O) were identified as key factors in the sheet-like crystal packing.

Conclusions:

  • The intramolecular O...CN interaction in 2-formylbenzonitrile is a weak nucleophilic attack, supported by both structural and computational data.
  • DFT and NBO analyses provide quantitative evidence for the electronic delocalization driving this interaction.
  • Intermolecular hydrogen bonding dictates the observed crystal structure, highlighting the interplay between intra- and intermolecular forces.