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Define Eclipsed Conformation
The C--H Bonds o the front carbon cover the C--H bonds on the back carbon
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What kind of conformation 
Eclipsed
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2 Characteristics of Eclipsed Conformation
- 1. Requires maximum energy
- 2. Occurs at θ = 0, +120 and -120 degrees (identically shaped)
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Define Staggered Conformation
Each C--H bond on the front carbon bisects the C--H bond on the back carbon, giving the atoms an alternating or window effect.
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Which conformation?
Staggered Conformation
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2 Characteristics of Staggered conformation
- 1. Requires minimum energy
- 2. Occurs at θ = ±180 & ±60 degrees
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Define torsional strain
Its an increase in energy and a decrease in stability
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What conformation will most likely have torsional strain
Eclipsed Conformation
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Define Steric Strain
Electron repulsion between atoms or groups, that are not bonded together but share the same space, that results in an increase in energy
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Define Anti Conformation
Bulky groups that are 180° apart
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Which conformation is this?
Anti Conformation
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Define Gauche conformations
Bulky Groups are 60° apart
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Which conformation is this?
Gauche Conformation
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Which conformation is more stable, Gauche or Anti?
Anti
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(T/F) Gauche and Anti are conformational isomers of each other
True
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Define Ring strain
An increase in energy due to geometric constraints on the ring
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The H's in red are...?
Axial
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The H's in blue are...?
Equatorial
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What does the chair flip do to equatorial and axial atoms?
It switches them, the axial becomes equatorial and the equatorial becomes axial
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Arrange these configurations by energy (1= least,3 = most)
Half chair, Chair, boat
- Chair: 1
- Boat: 2
- Half chair: 3
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Which chair configuration is this?
Half chair conformation
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Which chair configuration is this?
Boat conformation
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Which is more stable Equatorial or Axial?
Equatorial
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(T/F) The heavier the molecule the more stable it is in equatorial
True
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