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    Potential energy and Newman projections

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    Draw a diagram to show the changes in potential energy that occur from the rotation around the C1-C2 bond of 1-bromopropane. Draw Newman projection formulae to correspond with each maximum and minimum.

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    Because of the free rotation about the C-C bond, 1-bromopropane exists in many conformations (conformers).

    Drawing Conformations
    There are three common ways of drawing conformations:
    1] Wedges
    2] Newman Projections
    3] Sawhorse Structures
    The most common Newman Projections are as below.

    Newman Projections
    The molecule is drawn as if it is viewed straight down the C-C bond.

    The front carbon is drawn with 3 bonds in a Y shape
    The back carbon is drawn as a circle (O) with 3 bonds pointing out from it.

    1-bromopropane can adopt four important conformations.
    1] Totally Eclipsed (A)
    2] Gauche (B)
    3] Partially Eclipsed (C)
    4] Anti (D)
    Now  represents the angle between the C-CH3 ...