Topic: CIP - R/S nomenclature for L-cysteine and L-serine (Read 2585 times)

DoStateStuff · « **on:** May 30, 2016, 08:32:01 AM »

I've got a question that asks why the CIP R/S nomenclature for L-cysteine is opposite to that for L-serine. I can't for the life of me figure out what this question is asking?

Any help appreciated!

sjb · « **Reply #1 on:** May 30, 2016, 08:41:58 AM »

Quote from: DoStateStuff on May 30, 2016, 08:32:01 AM

I've got a question that asks why the CIP R/S nomenclature for L-cysteine is opposite to that for L-serine. I can't for the life of me figure out what this question is asking?

Any help appreciated!

What are the relevant structures?

DoStateStuff · « **Reply #2 on:** May 30, 2016, 09:25:04 AM »

Quote from: sjb on May 30, 2016, 08:41:58 AM

What are the relevant structures?

It asks to draw the three-dimensional structural enantiomers of L-cysteine (C3H7NO2S) and L-serine (C3H7NO3), and then the question above; why the R/S nomenclature is opposite

kriggy · « **Reply #3 on:** May 30, 2016, 09:52:31 AM »

Well
a) what are the structures?
b) what are the CIP priorities in those compounds?

Babcock_Hall · « **Reply #4 on:** May 30, 2016, 05:57:08 PM »

This is an interesting question that illustrates why the D,L system is more useful for the amino acids than the R,S system is, in one respect.

Topic: CIP - R/S nomenclature for L-cysteine and L-serine (Read 2585 times)

DoStateStuff

CIP - R/S nomenclature for L-cysteine and L-serine

sjb

Re: CIP - R/S nomenclature for L-cysteine and L-serine

DoStateStuff

Re: CIP - R/S nomenclature for L-cysteine and L-serine

kriggy

Re: CIP - R/S nomenclature for L-cysteine and L-serine

Babcock_Hall

Re: CIP - R/S nomenclature for L-cysteine and L-serine

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