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Topic: R,S naming for enantiomers  (Read 1726 times)

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Offline kauzs-17

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R,S naming for enantiomers
« on: February 13, 2014, 03:12:47 PM »
When dealing with a tetrahedron, you orient the molecule so that the lowest priority is facing a way from you. Then you trace from highest priority to second highest to determine R or S. However, I'm not sure if you include the top atom?
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Offline discodermolide

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Re: R,S naming for enantiomers
« Reply #1 on: February 13, 2014, 03:13:53 PM »
Yes, it is included.
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Offline kauzs-17

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Re: R,S naming for enantiomers
« Reply #2 on: February 13, 2014, 04:23:43 PM »
Let's say you have a bond to a CH3 and a Fluorine. Do you combine the atomic #s of the C and Hs for 9? If so which would have a higher priority?
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Offline sjb

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Re: R,S naming for enantiomers
« Reply #3 on: February 13, 2014, 05:10:49 PM »
Quote from: kauzs-17 on February 13, 2014, 04:23:43 PM
Let's say you have a bond to a CH3 and a Fluorine. Do you combine the atomic #s of the C and Hs for 9? If so which would have a higher priority?

No, F is higher priority than C. Have a look through http://en.wikipedia.org/w/index.php?title=Cahn%E2%80%93Ingold%E2%80%93Prelog_priority_rules&oldid=584877174 or similar
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