Sawhorse Projections

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Newman Projection of Butane
8:22 — by Leah F.

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Key Questions

  • A Newman projection is basically where you take a model (let's use C2H6 as an example) and look at it from the side. For C2H6, you would look straight down the C-C bond.
    enter image source here

  • Answer:

    Watch this video.

    Explanation:

    It is not going to be easy to explain it using words, refer to the below video for in details explanation.

  • i.stack.imgur.com
    source (for the diagram) here

    Since one can rotate the C-C bonds about each other we can have a number of conformations.

    conformers or rotamers are the isomers obtained when a molecule is rotated between a selected C-C bond
    .In the diagram shown above a propane molecule
    #C_aH_3-C_bH_2-C_cH_3# where a,b,c are the labels assigned.
    if one rotates this about #60^@# molecule about any of the #C_a-C_b or C_b-C_c#
    we obtain the different rotamers as shown in the diagram

    If one looks at the different rotamers shown:
    The first one consists of all the atoms in an "eclipsed conformation".Since these atoms are close to each other they repel and the magnitude of repulsion depends on how bulky or big the substituent is.
    Due to the presence of bulky groups and the repulsions caused the energy of the molecule in such conformations are highest while compared to the other conformations.
    Similarly we have staggered conformation in which the bulky groups are far away in such a way that the molecule's energy is least and hence it is stable.
    .
    example:
    Proteins are macromolecules.We define dihedral angle ie. the angle between two planes. At a particular conformation the proteins exhibhit catalytic activity.

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