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R/S configuration (and fisher projection) in amino acids

Ok so i was taught S config is where the priority is anticlockwise and R the opposite. But when i look at cysteine the priority is anticlockwise but its R?! Am i misunderstanding something?

Ill attach a diagram under this post
(edited 5 years ago)
Reply 1
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kiiten
OP
18
TSR.png
You have your CIP priorities incorrect. CH2SH is higher priority than COO

C --- S

is more important than

C--- O
Reply 3
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kiiten
OP
18
Original post by charco
You have your CIP priorities incorrect. CH2SH is higher priority than COO

C --- S

is more important than

C--- O


Yes i realised now where i was going wrong - I was assuming C-O was compared to C-H instead of C-S. Thanks :smile:

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