Gauche vs Anti

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Maggie Elgin 2A
Posts: 19
Joined: Wed Sep 21, 2016 2:57 pm

Gauche vs Anti

Postby Maggie Elgin 2A » Sat Mar 18, 2017 10:51 pm

I am having difficulty deciding when to use anti or gauche? Could someone explain the difference between the two Newman projections?

Emma_Green_2C
Posts: 21
Joined: Wed Sep 21, 2016 2:57 pm

Re: Gauche vs Anti

Postby Emma_Green_2C » Sat Mar 18, 2017 10:59 pm

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.

Cayla_Brooks_1I
Posts: 10
Joined: Mon Jan 26, 2015 2:17 pm

Re: Gauche vs Anti

Postby Cayla_Brooks_1I » Sun Mar 19, 2017 12:58 pm

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?

Nikhita_Jaaswal_2H
Posts: 31
Joined: Wed Sep 21, 2016 2:57 pm

Re: Gauche vs Anti

Postby Nikhita_Jaaswal_2H » Sun Mar 19, 2017 1:00 pm

No in the examples all given, anti is the most stable conformation

Tycho_Meimban_2B
Posts: 31
Joined: Wed Sep 21, 2016 2:57 pm

Re: Gauche vs Anti

Postby Tycho_Meimban_2B » Sun Mar 19, 2017 1:17 pm

Use Anti (180 degrees apart) for the most stable Newman projection, and use eclipsed for the least stable Newman projection.

Hope this helps!


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