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staggered vs eclipsed stability

Posted: Sun Mar 12, 2017 10:59 pm
by anatorres1B
I think I just misheard Dr. Lavelle in lecture, but I kind of confused myself as to why a molecule favor an eclipsed position as opposed to a staggered position? In my head, I guess I rationalized that the electron densities would favor a staggered state because of election - electron repulsion.

Re: staggered vs eclipsed stability

Posted: Sun Mar 12, 2017 11:20 pm
by Josh Ku 3H
I don't recall him saying that eclipsed is the most favorable position so I think you are right with your assumption in that the staggered formation should be more favorable. As you mentioned, a staggered formation would result in less electron-electron repulsion and thus the molecule would have less potential energy and would be more stable. This can also be seen in Butane on page 107 on the course reader as it tells you the energy values of the different conformations. Staggered in all cases, has the lower energy value and thus would be more stable.

I hope this helps!

Re: staggered vs eclipsed stability

Posted: Thu Mar 16, 2017 1:57 pm
by PriscillaMariscal_3F
I understand that a 180 staggered molecule is most stable, but does that mean it has the lowest energy conformation?

Re: staggered vs eclipsed stability

Posted: Thu Mar 16, 2017 6:19 pm
by Anna_Kim_2E
180 degrees - anti staggered would be the lowest energy conformation.