Today was a day to go over a lot of material regarding stereocenters. We covered everything from standard (R) and (S) configurations to enantiomers and diastereomers. Most of the class was spent trying to figure out how to separate a pair of enantiomers; in the end we came up with the idea of adding a second stereocenter of known configuration in order to make a pair of diastereomers and then separating those.
New topics dealt with prochirality, the concept of atoms that could be stereocenters if we did something to them. There are two kinds: Faces, which are termed re and si, depending on the orientation of substituents according to CIP rules; and pro-R/pro-S, in which we decide what stereochemistry an atom would have IF we made a change to one of the substituents (typically, converting an H to a D).
The picture shows si and re faces of F420 and NADPH. We will learn about such things soon!
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