conformational analysis

MS 900 - Conformers and Cyclohexane Practice Submitted by Matt on August 6, 2011.

Textbook and Chapter: Carey and Giuliano 8th Ed. (2010), Chapter 3

Keywords: conformational analysis, cyclohexane chair forms

Description: Reviews cyclohexane chair forms and conformations of butane:

  • Which dimethylcyclohexane is more stable 1,2-cis or 1,2-trans? Why?
  • Drawing chair forms
  • E2 anti-coplanar conformation and chair forms
  • Newman projects

Total Problems: 4

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Problem # 320

 

Let's perform conformational analysis on 2-methylbutane along the C2-C3 bond. We'll use the energy chart given below.

 

First, draw out the Newman projections along the C2-C3 bond, rotating the front carbon (C-2) by 60 degrees clockwise each time while keeping the back carbon (C-3) stationary.

According to the table above, how much energy does each conformation "cost?"

 

Second, make a plot of the total energy value for each Newman projection versus its dihedral angle.