enantiomer

[MoooShuuu]

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Given a molecule 3S,4S ---- if the molecule is 3R, 4S than is that the diasterisomer? When both are changed to 3R,4R then that is an enantiomer, right? I'm confusing myself here. What is an epimer than?

 

[joedat41]

yes and yes to the first 2 questions

 

[toothfairy87]

yes^2 and regarding epimers see wikipedia it's pretty clear and they have a good diagram

 

[myair]

Can some one explain for me why Given a molecule 3S,4S ---- if the molecule is 3R, 4S than is that the diasterisomer which is true but When both are changed to 3R,4R then that is an enantiomer?

I think they are meso. Will some one give me an example plz?

thanks

 

[zuma35]

It's only meso if the same groups are attached to both carbons.

 

[myair]

It's only meso if the same groups are attached to both carbons.

I just ask this from the other person just in case:
i
f we have:


----- oH--OH
cH3---c---c---cH3
------ H---H

this is a meso I agree. It is 2S-3R.

if we change one of the compunds

------oH--OH
cH3---c---c---cH2CH3
------H--- H

This will be enantiomers? It is 2S-3R?
if it is not then how the enantimer will look like?

thank you 🙂