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It asks which of the isomers is most stable. Cyclohexane with 3 methyl groups - 2 are right next to each other, and the last one is 2 over from that. The answer is the one with all 3 equatorial because large groups all equatorial to each other presents a molecule with the lowest energy.
But I thought I remembered reading somewhere - is there a case where a cyclohexane molecule is at lowest energy when its extra groups are all axial but facing opposite each other? Or am I making this up?
But I thought I remembered reading somewhere - is there a case where a cyclohexane molecule is at lowest energy when its extra groups are all axial but facing opposite each other? Or am I making this up?