Hi, thanks a lot for the great vid! Quick question, in 7:05 why do we assign the R-stereodescriptor to the C-Atom that's connected to the hydroxy group? Thanks!
Just follow the CIP rules. Remember, that if your lowest priority is not looking away from you, you'll have to rotate the molecule around. I've got a vide on that too, just dig through the older videos or click on the playlist in the description. I also have a thorough description of how to deal with the CIP rules and the R/S stereodescriptos up on the website.
I think I figured it out: so the hydrogen-atom that is drawn with a wedge, needs to be drawn next to the dashed hydroxy-group. I didn't know that. Victor, am I right in saying that dashed and wedges are next to each other always when they are on the same atom?@@VictortheOrganicChemistryTutor
@@nachhilfeerfolg969 It is a good practice to have your dashes and wedges on the same side of the molecule. Otherwise, it becomes ambiguous. I talk about it in one of my videos on stereochemistry, but I should probably make a dedicated one instead as it's a common mistake.
Thanks Victor! That was a great lesson. Well, actually I learned some new molecular rotation descriptors: the steering wheel, the sheesh kebab, and the single ladies! But seriously, I remember on a standardized test, I got caught with a question that asked whether 2 non-chiral molecules were enantiomers :(
These questions are such a fertile ground for traps! Definitions are very similar and you can always plant a ton of tricks in the molecules themselves. Things like “fake” stereocenters (meaningless dashes and wedges), using multiple representations, mixing up multiple terms in the same question, sigh, the list is endless.
@@VictortheOrganicChemistryTutor Definitely. Like you said in the other video, anyone wanting to do well in O-chem needs many hours of studying and practice.
