Oc?

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if you find R and S,
one is S,S and one is S,R👍

in a compound with two chiral centers, changing the sterochemistry at 1 chiral center results in diastereomers
structural isomers have same molecular formula, but different connectivity. these two compounds have same connectivity. hope this helps!
 
Last edited:
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Jab1113 said:
Can someone please explain to me how the structures in #81 are
Diastereomers? I thought they were structural isomers.....

http://www.ada.org/sections/educationAndCareers/pdfs/dat_test_sampleitems.pdf
Click to expand...

Molecule on the left: from left to right : Two asymmetric centers, with configuration of S, S
Molecule on the right: from left to right : Two asymmetric centers,with configuration of S, R
Diastereomers have one asymmetric center same, the other one different ( asymmetric carbon on the left maintains S on both molecules, while asymmetric carbons on the right have opposite configuration).
 
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all you need to pay attention to is that, one is cis and the other one is trans. always cis and trans are diastomers.
 
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