Organic chemistry: Stereochemistry (3)

[dorsydoll]

What is R and What is S?

[soheil1212]

wish every teacher took time like you to explain this confusing branch of chemistry... amazing

[HockeyPlayer58]

@faintsnow You gotta be aware of the fact that horizontal lines are coming out of the board and vertical lines are going into the board. If you rotate the left hand molecule 180 degrees towards you, you are not going to get the right hand side molecule. Moreover the R and S naming for each chiral center will be affected so that type of rotation isn't allowed in fischer projection.

[FaintSnow]

@ 1:56 , if you rotate the molecule towards you 180 degrees, you would have the same molecule. Is it only for clockwise/counter-clockwise rotation or also for 3D rotation?

[Naudins]

Question:

The two molecules he just drawed on 1.55, why aren't they the same? If you rotate it 180 degrees towards you (imagene it coming out of the blackboard) you end up with exactly the same, don't you? Or aren't you allowed to do that in this projection?

[saurabhsacker]

thumbs up to the student for asking good questions.

[ajinkyakamat2000]

1 Question; at 6:45... the eg. of R and S naming... isnt it the same group attached at 2 and 3 priority ?

[reddhawkk]

@ajinkyakamat2000 Group 2 is ch2-ch3 or ethyl. Group 3 is ch3, methyl. Ethyl has a higher priority than methyl. hope that helps

[cerealninjakilla]

@ajinkyakamat2000 I agree. I don't see how the carbon is attached to 4 different substituents. I see a Methyl Bromide ethyl and ethyl.

[abpete1]

Once again great teaching

[niznet84]

Thanks!!!!!!

[ThePolynumeral]

love the trick, was having some problem tilting my head this way and that to look down the lowest priority.This has made it so much clearer now. Many thanks.

[shantymehsud]

instead of donating money it think i shud gift u a shirt.....hahahaha...jst kidding..i like simplicity

[TheWholefoodfarmacy]

Great vidio

[qrais]

I could never EVER in my life thank you enough for you amazing contribute to the human knowledge...but I want you to know that one day I will pay you back. you got my word on that...from your biggest fan. thank you sir

[ravnsfan05]

Why is every hating on junglee786? He just commented saying "better audio would have been nice". I don't really see how that's offensive. He's letting the teacher (who is very helpful) know that at times the audio is a little unclear.

Lay off people.

[scuzzulus]

great vid...but i didn't quite follow at 2:20 where you swap the Ch3 and the H...doesn't look like an mirror image, but it just is one by definition because you made a single swap at the stereo center? someone pls clarify..thanks

[LadyKiriTheFallen]

@scuzzulus yea it's still a mirror image b/c of the swap. My prof pulled a swap like that on me once and i mistook it for a const. isomer; i'm glad he had an example like that in his video b/c i would've never figured out why

[tesfat09]

Aren't the dashes you are drawing for the atoms pointing away used specifically for transition state dashes and so would not be appropriate to use when talking about things that are pointing away.

[MagaCarey]

I adore all your videos! Thank you so much!

[iStudy101]

Thank you very much for the R/S system! :)

[savysosa]

thanks your videos have helped me this semester... this review helped learn NMR on chiral atoms. thx

[deliamalone]

It seems that with this kind of representation that the 1 and 4 are coming from the same area, so when I swap them that doesn't really change much.

For example, in the second example (the first one with swapping) if I made a clock face out of the drawing H is at 6:00 and Br at 5:00, when I swap them who cares? They both would go counterclockwise to get to the methyl before the ethyl.

What gives?

[aicharunim]

@deliamalone Even I had the same problem....

[Musicchick717]

It is "enantiomer"

[mans1533]

you are the best

[ywang252]

I cannot understand antimers fully.

[GogetaSSJ10]

@ywang252 maybe cause you spelled it wrong



[Laggminator]

Easy to follow

Very good job!

[junglee786]

thanx! (better audio wud be nice ^-^ )

[Sonolumino8939]

@junglee786 Lol fuck off dude, this guy is giving out great information for free. Kill yourself you ungrateful bitch ^-^

[junglee786]

@Sonolumino8939 you need some manners and class

[Sonolumino8939]

@junglee786 You need to learn to be grateful for free wonderful information. Ass.

[dodoblaster]

@Sonolumino8939 Better but not quite there:D But agreed great videos.

[InfamousShogun]

@junglee786 yo dick, u need to appreciate the work this man of god is doing for humanity

[MrNatty513]

@junglee786 you must have Shitty Speakers