What is the configuration (R or S) of these molecules?

  • Thread starter sd34
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Summary
Hi. Can someone tell me which molecule is R or S?

For me, the first one is S and the second one is R.
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mjc123

Science Advisor
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I think the first is R and the second is S.

Can you explain how you arrived at your answers?
 
8
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I think the first is R and the second is S.

Can you explain how you arrived at your answers?
Yes, it’s correct.

Basically the mistake I made was that I gave the first priority to COOH instead of NH2 in the first molecule, whereas in the second one I forgot to switch from R to S.
 

mjc123

Science Advisor
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314
You've forgotten the other C atom on the C 2 atoms from the stereocentre on the chain you labelled 2.
 
8
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You've forgotten the other C atom on the C 2 atoms from the stereocentre on the chain you labelled 2.
Okay, but isn’t the priority still the same?
 

mjc123

Science Advisor
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314
No, that C trumps the H on C2 on the other chain.
 
8
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No, that C trumps the H on C2 on the other chain.
If it’s not too much of a trouble, could you redraw the molecule?
 

mjc123

Science Advisor
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314
molecule.png
 

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