Cahn-Ingold-Prelog Convention (Determining R/S)
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- เผยแพร่เมื่อ 25 ส.ค. 2024
- In this clip, the Cahn-Ingold-Prelog Convention is introduced, to allow for assignment of absolute configuration of stereocenters. I dunno why it took three dudes to make the convention, but it's pretty sweet if you think about it.
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You have explained the Cahn-Ingold-Prelog convention well, my dear Prof Dave! Thank you so much!
Wow, this was super helpful!! The way you explained it and made it so simple makes me feel dumb for not getting it in the first place😂
I had been spending hours figuring out R and S and the E and Z config!!! But prof Dave.. You have saved my day.. Your videos are super cool and way way easier to process mentally than the hours of lectures i have heard..
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the fact that my profs try to make us waste our time building every molecule to assign R and S is absurd - thanks so much for this new technique, it's so much more efficient!
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HOLY FUCKING SHIT FINALLY A WAY TO ASSIGN R AND S WITHOUT CONCEPTUALIZING!!!!
I can't believe it's that easy! You explained in a single video a concept that boggled me for an entire semester
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thank you so much. I have looked everywhere until i got you. this explains my predicament. I knew the wedge or dashed hydrogen but when in the plain the textbook I use said nothing about it. Thank you so much
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Thanks for clarifying the priority system.
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Professor Dave Explains but if they do not give where the wedge bond and dash bond is how would I know whether the hydrogen is in the front or back of the compound
prathyush srinivasan good question, you can't! some kind of three-dimensional notation must be used to assess stereochemistry.
Professor Dave Explains oh okay
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watched a days worth of r/s configuration, I think this is the best method
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i simply remembered 2 acronyms: ACR and TCS.. to elaborate, if the lowest priority group (usually H but not always) is away from me and i count the groups in a clockwise order, then the molecule is designated (R). If LPG is towards me and it's clockwise then it's (S). idk if that helps
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For the last molecule, its easier to just change the 3D perspective than re-arrange the atoms. Simply imagine a stick with 3 balls stuck to the end, and rotating the stick makes the balls rotate with it. Now rotate it until the H-Ball is in the back, and count priority from there. Now you don't have to flip the rules, since you did not change the molecule and you still get the same answer: S.
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Shouldn't the original one be R? Cuz the Ethyl is to right, so H-H-H < H-H-C, like in last problem, the one with CIP convention? Please tell me if I'm going way too far from the point.
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i really liked the method of orienting myself in the plane and see the structure. and get the answer quickly
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i know a mnemotechnic help with the r/s. if you have the substituent 4 already away, picture yourself turning a car. the molecule is steering wheel and you turn it from 1 to 2 and then 3. if your imagined car is going right, it's R, if left, it's S.
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7:40 U can flip between the other 2 groups ( right and left) as well at the same time.
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why there isnt a corbon attached to 3 which is the methyl group
the which what now?
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there's also another trick it can help you guys to get the right absolut configuration which's if you've a pair number behind ( in back ) you'll assign directly ( clockwise ) if you've an impair number in back then you'll assign inversely ..
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Important point at 2:49
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