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To determine chair conformation stability, add up the "A-Values" for each axial substituent. The lower that number is, the more stable the chair.
Ch 3 : Cyclohexane
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Cyclohexane Chair Conformation Stability: Which One Is Lower Energy?
The diaxial conformation of cis-1,3-dimethylcyclohexane is approximately 23 rac{kJ}{mol} (5.4 rac{kcal}{mol}) less stable than the diequatorial conformation. Draw the two possible chair conformations, and suggest a reason for the large energy
Draw the least stable Newman projection for isopropylcyclohexane.
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