Calculating Energy Difference Between Chair Conformations Video Lessons

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Concept: Explaining how A-Values are related to cyclohexane flip energy

Problem: A conformation for a cyclohexane derivative is shown below. Calculate the interaction energy for this form. Show calculations. __________________ kcal/molWhat is the name of this form? _______________ Interaction Energy Table:Interaction                                                                        Energy (kcal/mol)H : H eclipsed                                                                   1.0CH3 : H eclipsed                                                               1.4-CH- : -CH- eclipsed "flagpole" interactions                   2.5CH3 : iPr gauche                                                               1.3CH3 : tBu gauche                                                              2.1CH3 : H 1,3-diaxial                                                             1.0tBu : H 1,3-diaxial                                                              2.0iPr : H 1,3-diaxial                                                               1.3Staggered interactions                                                     0

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Problem Details

A conformation for a cyclohexane derivative is shown below. Calculate the interaction energy for this form. Show calculations.

__________________ kcal/mol

What is the name of this form? _______________

Interaction Energy Table:

Interaction                                                                        Energy (kcal/mol)

  • H : H eclipsed                                                                   1.0
  • CH3 : H eclipsed                                                               1.4
  • -CH- : -CH- eclipsed "flagpole" interactions                   2.5
  • CH3 : iPr gauche                                                               1.3
  • CH3 : tBu gauche                                                              2.1
  • CH3 : H 1,3-diaxial                                                             1.0
  • tBu : H 1,3-diaxial                                                              2.0
  • iPr : H 1,3-diaxial                                                               1.3
  • Staggered interactions                                                     0

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