Chm Ch 3: Definitions

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DesLee26
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237562
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Chm Ch 3: Definitions
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2013-09-28 19:08:24
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  1. conformations
    different spatial arrangements that a molecule can adopt due to rotation about sigma bonds
  2. staggered
    a low energy conformation where the bonds on adjacent atoms bisect each other (60o dihedral angle), maximizing the separation
  3. eclipsed
    a high energy conformation whhere the bonds on adjacent atoms are aligned with each other (0 degree dihedral angle)
  4. Energy maxima and minima correspond to __ and __.
    • staggered
    • eclipsed
  5. __ rotation causes __ or __ strain.
    • sixty degree
    • torsional¬†
    • eclipsing
  6. steric
    destabilization due to repulsion between the electron clouds of atoms or groups. Groups try to occupy some common space
  7. torsional
    destabilization due to the repulsion between pairs of bonds caused by the electrostatic repulsion of the electrons in the bonds. Groups are eclipsed
  8. Angle
    destabilisation due to distortion of a bond angle from its optimum value caused by the electrostatic repulsion of teh electrons in the bonds (ex: cyclopropane)
  9. anti
    description given to two substituents attached to adjacent atoms when their bonds are at 180 degrees with respect to each other
  10. syn
    description given to two substituents attached to adjacent atoms when their bonds are at 0 degrees with respect to each other
  11. gauche
    description given to two substituents attached to adjacent atoms when their bonds are at sixty degrees with respect to each other

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