When cyclohexane is substituted by an ethynyl group, -C=CH, the energy difference between axial and equatorial conformations is only 1.7 kJ (0.41 kcal)/mol. Compare the conformational equilibrium for methylcyclohexane with that for ethynylcyclohexane and account for the difference between the two.

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When cyclohexane is substituted by an ethynyl group, -C=CH, the energy difference
between axial and equatorial conformations is only 1.7 kJ (0.41 kcal)/mol. Compare the
conformational equilibrium for methylcyclohexane with that for ethynylcyclohexane and
account for the difference between the two.
Transcribed Image Text:When cyclohexane is substituted by an ethynyl group, -C=CH, the energy difference between axial and equatorial conformations is only 1.7 kJ (0.41 kcal)/mol. Compare the conformational equilibrium for methylcyclohexane with that for ethynylcyclohexane and account for the difference between the two.
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