How to determine whether the face of the attached alkene is re or si?
If assigning priorities in regard to the left C atom it is re, but for the right C atom it is si. How is it actually determined?
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1 Answer
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I’m pretty sure that this depends on the atom attacked. Most attacks on double bond are stepwise to a certain extent. And even when they aren’t, the absolute configuration should be discussed on a per-atom basis.
But if you have a concerted reaction and want to label both: (2si,3re).
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$\begingroup$ Is there any other way to label them? If the alkyl chains are too complex, it isn't easy to determine the locants of these C atoms (like 2 and 3 in the given example). $\endgroup$– EJCCommented Aug 21, 2016 at 15:55
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$\begingroup$ So it is obligatory to know the name of the compound with all the locants to be able to name the face properly. $\endgroup$– EJCCommented Aug 21, 2016 at 17:01