Not conformational isomers...but why?

[SaintJude]

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Why are these not conformational isomers? They are actually enantiomers.

 

[syoung]

because they are non-superimposable mirror images?

 

[syoung]

http://en.wikipedia.org/wiki/File:Isomerism.png

 

[pfaction]

Conformational: SAME molecule rotated along an alpha bond.

 

[Buttafuoco]

Just assign priorities and find the absolute conformation. The one on the left is S and the one on the right is R.

You can think of it this way, too- take either one of them and rotate is 180 degrees. Then it should be clear to you that they're mirror images.

 

[SaintJude]

Just assign priorities and find the absolute conformation. The one on the left is S and the one on the right is R.

You can think of it this way, too- take either one of them and rotate is 180 degrees. Then it should be clear to you that they're mirror images.

hahaha--when people give me the definition of enantiomer (" are non-superimposable mirror images") , it's embarrassing unfortunately, i can't see that 😳

i think i'm just gonna have to resort to checking absolute confirmation, b/c it's difficult for me to see the answer.

 

[chiddler]

because they are non-superimposable mirror images?

what is the "?" for? I usually use that in the context of "well duh", and your response seems rude. but maybe you had different intentions than i am interpreting.

if not, please have some respect.

 

[milski]

what is the "?" for? I usually use that in the context of "well duh", and your response seems rude. but maybe you had different intentions than i am interpreting.

if not, please have some respect.

I use it when I have a reasonable suggestion but I'm not 100% sure that I'm correct?

 

[Buttafuoco]

hahaha--when people give me the definition of enantiomer (" are non-superimposable mirror images") , it's embarrassing unfortunately, i can't see that 😳

i think i'm just gonna have to resort to checking absolute confirmation, b/c it's difficult for me to see the answer.

That's the best way then. Just do whatever you're most comfortable with.

 

[syoung]

I use it when I have a reasonable suggestion but I'm not 100% sure that I'm correct?

No it was just me making sure if it was, asking about it.

 

[chiddler]

i'm sorry my interpretation was wrong. please understand that i thought i saw very uncivilized behavior.

 

[411309]

Isn't the left one R and the right one S? OH highest priority then C2H2 second highest priority.

 

[Buttafuoco]

Isn't the left one R and the right one S? OH highest priority then C2H2 second highest priority.

You have to reverse the direction on a Fisher Projection when the low priority group is coming out of the page (on one of the sides).

 

[MedPR]

Isn't the left one R and the right one S? OH highest priority then C2H2 second highest priority.

In fischer projections, think "horizontal is horribly wrong". Meaning whenever hydrogen is horizontal (pointing out of the page), whatever configuration you get is wrong. So if you get R, it's actually S.

hahaha--when people give me the definition of enantiomer (" are non-superimposable mirror images") , it's embarrassing unfortunately, i can't see that 😳

i think i'm just gonna have to resort to checking absolute confirmation, b/c it's difficult for me to see the answer.

A trick to remember with these types of questions is that the switching of any two groups results in an enantiomer. In this case, the Me and Et are switched.

 

[syoung]

In fischer projections, think "horizontal is horribly wrong". Meaning whenever hydrogen is horizontal (pointing out of the page), whatever configuration you get is wrong. So if you get R, it's actually S.




A trick to remember with these types of questions is that the switching of any two groups results in an enantiomer. In this case, the Me and Et are switched.

👍👍 much easier than mine.