Cyclohexane ring flip and relative conformation energies
Conformations:
A: chair
B: twist-boat
C: boat
D: half-chair
Valleys of the pink graph are conformations lowest in energy (shown as A & B). Peaks are conformations highest in energy (shown as C & D). Energies are A<B<C<D with D highest & A lowest in energy. A is thus the most stable conformation &, of all the other conformations, occurs most often in room temperature.
Valleys A & B are local energy minima & A is global minima. A & B can thus be classified as conformers. Peaks are not conformers. Energy differences are mostly caused by anglular strain.
Source for conformer classification:
- Pure & Appl. Chem., Vol. 68, No. 12, pp. 2193-2222, 1996
Source for the relative energy differences & other info in this description:
- J Clayden, N Greeves, SG Warren (2001). Organic chemistry. (2nd ed.). p. 373. ISBN 9780191666216.
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