Torsional Strain vs steric strain  [ENDORSED]

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Torsional Strain vs steric strain

Postby Adam_Alyafaie_1L » Mon Mar 13, 2017 1:38 am

From what I understand, torsional strain is when electron densities are to close(like in an eclipsed conformation) and steric strain is when atoms are too close together. However, when atoms are too close together aren't their electrons too close and thus it also has torsional strain? So do they go together?

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Re: Torsional Strain vs steric strain  [ENDORSED]

Postby Chem_Mod » Mon Mar 13, 2017 10:11 am

Torsional strain and steric strain often occur together. Think of the example I did in class with butane. When the dihedral angle was zero there was both torsional strain and steric strain.

But they don't have to occur together. Think of the example I discussed in class with a substrate fitting into the active site. If the fit is not good it is usually due to atoms 'not fitting' that is, they are bumping into each other resulting in unfavorable nonbonding interactions (steric strain).

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