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Gauche vs Anti

Posted: Sat Mar 18, 2017 10:51 pm
by Maggie Elgin 2A
I am having difficulty deciding when to use anti or gauche? Could someone explain the difference between the two Newman projections?

Re: Gauche vs Anti

Posted: Sat Mar 18, 2017 10:59 pm
by Emma_Green_2C
Gauche is when the large atoms are staggered adjacent to each other (60 degrees) and anti is when the large atoms are opposite each other (180 degrees). Both are staggered but the names gauche and anti tell you the different energies of the conformations. Anti is the most stable (lowest energy) and gauche is less stable than anti but more stable than eclipsed.

Re: Gauche vs Anti

Posted: Sun Mar 19, 2017 12:58 pm
by Cayla_Brooks_1I
If a problem were asking you draw the most stable and least stable form, would there ever be a situation where Gauche is more stable than Anti?

Re: Gauche vs Anti

Posted: Sun Mar 19, 2017 1:00 pm
by Nikhita_Jaaswal_2H
No in the examples all given, anti is the most stable conformation

Re: Gauche vs Anti

Posted: Sun Mar 19, 2017 1:17 pm
by Tycho_Meimban_2B
Use Anti (180 degrees apart) for the most stable Newman projection, and use eclipsed for the least stable Newman projection.

Hope this helps!