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Asked Dec 26, 2019
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Draw both conformations for 1-ethyl-1-methylcyclohexane and decide which conformation (if any) is more stable.

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Concept introduction: Conformation isomers are formed by the rotation about single C – C bond while the atoms and connectivity remains same. For cyclohexane the most stable conformation is chair conformation in which all the carbon-hydrogen bonds are staggered. Axial bonds are above or below the plane of the ring while equatorial bonds are in the plane of the ring.

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The structure of both the conformations of 1-ethyl-1-methylcyclohexane are, Axial Equatorial CH,CH, CH, `CH, "CН.CH, 1-ethyl-1-methylcyclohexane 1-ethyl-1-methylcyclohexane Figure 1 The conformation in which the ethyl group is present on equatorial position has minimum steric repulsions. Hence, this is more stable conformation.

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