Which Chair Config is More Stable: Axial or Equatorial?

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SUMMARY

The discussion centers on the stability of chair conformations in cyclohexane derivatives, specifically comparing two isomers, A and B. It is established that conformer A, which features three equatorial methyl groups, is more stable than conformer B, which has only one equatorial methyl group. The key takeaway is that when assessing stability, one must compare the most stable conformers of each compound rather than all possible configurations. The correct answer to the stability question is that conformer A is indeed more stable than conformer B.

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  • Understanding of chair conformations in cyclohexane
  • Knowledge of equatorial and axial substituent positions
  • Familiarity with steric strain and its impact on molecular stability
  • Ability to draw and analyze conformational isomers
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  • Study the concept of steric strain in cyclohexane derivatives
  • Learn to draw and evaluate multiple chair conformations for complex molecules
  • Research the impact of substituent size on conformational stability
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Chemistry students, organic chemists, and anyone interested in understanding molecular conformations and their stability in organic compounds.

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The question asks which is the more stable conformational isomer (A or B). i drew both chair configurations for each (see pic below). For the first chair, isn't B more stable because it has 1 eq. while A has none? For the second chair, isn't A more stable because it has 3 eq, and B only has 2?

How do you determine overall which is more stable after drawing all 4 chairs (correct answer is A)?http://i.imgur.com/V5zHt.png
 
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Yes, the confomer of A that has 3 axial methyl groups has higher energy than the confomer of B that has only 1 axial methyl group.

That is not the question. Your question was what compound is more stable. You look at the most stable conformer of each compound and compare only those two structures.
 

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