Dihedral Angles

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Dihedral Angles

Postby samchung2f » Thu Mar 16, 2017 9:48 pm

For dihedral angles, why is it that the dihedral angle made by atoms H1-C1-C2-H2 is 0 in the eclipsed ethane molecule on page 105 of the organic chemistry textbook?

Karan Ishii 3E
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Re: Dihedral Angles

Postby Karan Ishii 3E » Fri Mar 17, 2017 12:50 am

Dihedral atoms of eclipsed conformations are 0 because they line up so there's no angle if you look at them from a Newman projection.
You're comparing the angles between the 3 hydrogens of each carbon to the other hydrogens. If the hydrogen atoms arranged around the carbon were staggered then there would be space between them on a Newman projection and there would be an angle of 60 degrees.

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