File:Butane conformations and relative energies.svg
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[edit]DescriptionButane conformations and relative energies.svg |
English: Newman projections of butane conformations & their relative energy differences (not total energies). Conformations form when butane rotates about one of its single covalent bond. Torsional/dihedral angle is shown on x-axis.
Conformations (according to IUPAC): A: antiperiplanar, anti or trans B: synclinal or gauche C: anticlinal or eclipsed D: synperiplanar or cis 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 rotamers (a class of conformers). Peaks are not rotamers, & are caused by repulsive forces of the hydrogens & methyls (-CH3). Source for conformation names & conformer classification:
Source for the relative energy differences & other info:
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Date | |
Source | Own work |
Author | Keministi |
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