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Birch reduction uses solvated electrons as reducing agents. The reaction converts benzene to 1,4-cyclohexadiene. The reaction proceeds by the transfer of a single electron to the ring to form a benzene radical anion. This anion is highly basic—it abstracts a proton from the alcohol to form a cyclohexadienyl radical. Another single electron transfer gives the cyclohexadienyl anion. A proton transfer from the alcohol forms 1,4-cyclohexadiene. Since this reduction occurs via radical anion...
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1,2-Diiodo-4,5-dimethyl-benzene.

Bruce A Hathaway1, Uriah J Kilgore, Marcus R Bond

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Acta Crystallographica. Section E, Structure Reports Online
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This study reports the first crystal structure of a diiodo-dimethyl-benzene molecule. The molecular structure exhibits mm2 symmetry, with slight elongation due to steric repulsion, and forms hexagonal close-packed layers in the solid state.

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Area of Science:

  • Crystallography
  • Organic Chemistry
  • Solid-State Chemistry

Background:

  • Diiodo-dimethyl-benzene isomers are important in organic synthesis.
  • Understanding the solid-state structure provides insights into intermolecular interactions.

Purpose of the Study:

  • To determine and analyze the crystal structure of a specific diiodo-dimethyl-benzene isomer.
  • To investigate the molecular geometry and packing in the solid state.

Main Methods:

  • Single-crystal X-ray diffraction was used to determine the molecular and crystal structure.
  • Analysis of bond lengths, bond angles, and intermolecular contacts was performed.

Main Results:

  • The compound C(8)H(8)I(2) exhibits mm2 symmetry, consistent with theoretical expectations for the free molecule.
  • Steric repulsion between iodine atoms and methyl groups causes a slight elongation of the molecule.
  • In the solid state, molecules form inversion-related pairs within approximately hexagonal close-packed layers.
  • Layer stacking optimizes dipole-dipole interactions through head-to-tail arrangements.

Conclusions:

  • This is the first reported crystal structure of a diiodo-dimethyl-benzene.
  • The molecular structure is influenced by steric effects, leading to a distorted geometry.
  • The extended structure reveals efficient packing driven by intermolecular forces, particularly dipole-dipole interactions.