Chirality - Orgo destroyer help

[Psa]

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Wouldn't the lower chiral center be S as well? This is from 2010 destroyer question #215

 

[LazyP]

No it should be R since the Hydrogen is facing towards you so you have to inverse the configuration from a S to R.
1) Br 2)the 1st chiral carbon above with Cl attached 3) COOH so its going counterclockwise but since the hydrogen is facing towards you, it should be clockwise (R)

 

[Psa]

I thought COOH gets ranked 2nd?

 

[Jordwin]

The Cl takes a higher priority than the oxygen, whether the carbon has 3 or 1 oxygens it doesn't matter, the Cl on the other carbon only "faces off" against one of the oxygens and Cl wins.

 

[Dotoday]

You rank what is attached directly to a chiral carbon. Since Cl weighs more than C, Cl ranks higher than COOH.


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