R,S system | Stereochemistry | Organic chemistry | Khan Academy

How to assign the configuration of a chirality center using the R,S system.
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Organic Chemistry on Khan Academy: Carbon can form covalent bonds with itself and other elements to create a mind-boggling array of structures. In organic chemistry, we will learn about the reactions chemists use to synthesize crazy carbon based structures, as well as the analytical methods to characterize them. We will also think about how those reactions are occurring on a molecular level with reaction mechanisms. Simply put, organic chemistry is like building with molecular Legos. Let's make some beautiful organic molecules!
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[@nuggetsrawesomexx124]

Is there a video where you can explain how to mentally rotate the atom if the hydrogen is in the plane? That seems to be my biggest issue with stereochemistry

[@SandeepKumar-se4ey]

Matt Nuguid

[@cmhardin37]

You just swap the hydrogen for the atom point away from you. The answer that you get will be the opposite of the original molecule's absolute configuration! You're Welcome.

[@craigpointon8394]

get a model kit fella

[@100d2h]

Use pencils as bonds if u cant see i did it in class lol

[@_shivesh_12]

Matt Nuguid he said that its in the khan academy vid "Enantiomers and friends"

[@endod8708]

khanacademy is saving my butt

[@Jessica-zf8kh]

amen

[@shayganzedix6226]

Same as me for tonight

[@thenaysays]

as always

[@aanagul8787]

one of the best RS SYSTEM video. watch it

[@user-uv7im9yp2t]

I have been struggling to understand this concept, but this video managed to make me crystal clear on this topic the night before my exam. Thank you so much Khan academy

[@julianaroseannetambis8584]

You sound like Jim from the Office and it's keeping me going.

[@ClaudeVids]

thank you will be getting an A on my orgo exams thanks to you

[@rezapahlaviisking]

did u actually end up getting A? lol

[@radius34]

apparently he got a 78 on his first test.

[@antimatter31]

@@rezapahlaviisking no

[@nattcattt]

This video saved my life. Was staring at my book trying to figure out what the heck I was reading. This cleared EVERYTHING up!

[@jyotirathi3048]

U r the best chemistry teacher I've ever seen in my life...ur r truly a life saver😍😍

[@syedabbas3510]

YOU ARE GODSEND---THANK YOU!

[@k.gautam8009]

this is the academy where i clear my doubts really,all others say all dash dash......things...

[@palmtoptiger3940]

you made it so simple, my OChem professor will love this

[@hamedhosseini4938]

HAHAHAHA is he bad?

[@Euphytos]

Thanks dude, you're great

[@sarashafi9078]

Thank you very much it helped me a lot

[@amandababesify]

Thank u so much this is the first video iv seen where its properly explained even my lecturer didnt explain it like this. Thanx a million times

[@javedakhtar1534]

sir, please explain the R,S system of chiral allenes and it's Fischer projection.

[@salmasalah352]

where's the video where you explain the R &S Rotation ???!

[@lilbaepretty3955]

you are the real life saver. I understood in the first 2 minutes. My o chem teacher had a week to make me understand and he FAILED! WOW

[@mbrown3506]

Khan I thought you'd come with some harder examples. My exams are nothing like this kiddy stuff honestly.

[@ramchandrashetty4365]

Thank u very much & God Bless u!

[@aashayzanpure4248]

Ramchandra Shetty u look like a chem teacher who himself doesnt understand what R and s is and so u came to this video to understand it better...

[@pritishsahoo7830]

LOLLLLL so true

[@mmaking8664]

YES YES YES THANK U THANK U THANK U U EXPLAINED TO ME WHAT MY SHITTY LECTURER COULD NOT EXPLAIN TO ME FOR A COUPLE OF LECTURES

[@Rnmohammedsaleh]

Thanks you very much im a palestinian pharmacy student and im understand your explain you are very very good and i prayer to my god give you your hope and your want ❤❤

[@advaitharun6072]

@ 3:18 how do we know that the hydrogen is present ? We did'nt represent it in the fig.

[@rezapahlaviisking]

seriously yall who is disliking these videos?!

[@5Youssif]

ak lectures

[@johnmandrake8829]

you make it very clear. Thank you

[@advaithaajeyakumar5903]

Damn this is...AWESOME !!! thanks a lotttttttt man

[@dannieel1327]

Tysm... It has help me out within nine mins to understand it properly. Hope to c further more

[@albinopanda9255]

Who has a test on this tomorrow, and looking through these comments?

[@hananemoussa4346]

I was only able to understand R,S system with this video! THANK YOU

[@AodhanBeag]

That last trick 👌🏼

[@sanskrutishinde280]

Khan Academy is a saviour! Thank you.

[@zenjohnston122]

Bless you for saving me from my pedagogical sin of a class.

[@jennylopez8440]

love that little trick at the end - thanks!!!

[@swkit125]

Your explanation better than my teacher........ thanks

[@nirgunkaur3161]

thank you so much!

[@subhosmitaburman3648]

Very helpful👍👍

[@Mr_Bahama]

KHAN, YOU GUYS ARE THE BEST!!!!

[@anotherhumanbeing9171]

Thank u ,That's well explained.

[@KainCorvin]

THANK YOU!! You are freaking lifesaver!

[@fraancescar-l7059]

Thank you!!! 2m in and I get it way more than 30m research elsewhere!

[@jnzed94]

Good stuff but seriously, the audio is TOO LOW. I have my volume all the way up and it still sounds low.

[@rausanfikri4235]

nice try dude, thanks for this video, it's make me easier to study stereoisomer autodidact

[@sunsiree644]

THANK YOU SO VERY MUCH! ... from Thailand

[@kalllinda2]

Is there a video where the L, D system is explained?

[@sgtghost141]

d- and l- system is comparatively easier than this

[@martinacervova]

Thank you

[@danielazapata9456]

How do you do this when there are two chiral centers??

[@abhijitmondal4256]

consider one center at a time, and treat the four of its connections without worrying about their chiralty

[@anitamhatre6884]

Thank you sir.... It was very helpful

[@zulamanavraj9669]

thank you

[@erfankamaran4893]

Thank you,its very helpful

[@oochay5485]

you da man

[@utkarshsaini2021]

Nice ways to teach us.... Get efficient knowledge👍

[@ranadev3842]

Thanks 🌹

[@giyekari]

I don't understand the last part about looks R but is actually S, when do you use that trick? when the main prioritized group is pointing back? someone please help my test is coming up soon😭😭

[@randominternetprofile8270]

giyekari in order to identify whether R or S, the hydrogen needs to be pointing away from you. If you come across a molecule where H is pointing towards you, you can still determine the order and whether it's going clockwise or counterclockwise, to determine S or R. Now once you have done this, remember, since the H is towards you, and for example, if you found it was S....all you have to do is choose R for your answer. Being only 2 options (R or S), and only 2 directions (counter and clockwise), the most logical explanation would be the direct opposite of the wrong answer. Hope this makes sense.

[@tundebanwo]

When the H is coming towards you in space and not away from you.

[@SissouwChan]

THANKS

[@asifanasir6384]

Thanks a bunch sir!

[@user-jd9jw4co5h]

Thank u so much 👌🏻💙💙

[@breannadoucette-garr8737]

Thanks. Great video.

[@creativefruittree3480]

may God bless u people

[@otaku0773]

Amazing thanks!

[@mhmdyxz8612]

Incrediple man 👌

[@gokulavasan8422]

Well explained..

[@ExtremeGamingi]

thank you!

[@MichaelMaherMusic]

Thank you so much , that really helped me a lot !! :D :D

[@skeche]

If all enantiomer are pairs where they are mirror images, non-superimposable, and one has to be R the other S configuration, does this mean the last example where both are S configuration are not enantiomers of each other despite isomerisation?

[@theimprovist4158]

Excellent video

[@fakhrulnawawi9681]

What if the priority of number 1 and 4 is on same plane... Should we convert it?

[@md.shahoriarnazirsabbir4932]

Thank you. :)

[@leehanbin7861]

Informative

[@ratribiswas6378]

If the configuration of two structures are same then what type of isomer will they be?

[@soumenmandal6927]

thankssss.....

[@haziqahnasir5224]

I've a question. for the ethyl group, do we don't need to add all the atomic number of all element. I mean like C2H5. C is 6 so multiple by 2 is 12 and add 5 because of the 5 hydrogen atom. So it will be 17. compared to OH equal is 9. So, ethyl group is more priority compared to OH group. am I right? Is it my method is wrong? Or it need to compare with same level of functional group? comparing methyl with ethyl and only? you know what I mean right? I really need your help

[@olliebingham9063]

haziqah nasir this was my thought as well, but I think it's the atom directly bonded that dictates the priority, so because oxygen has a higher atomic number than carbon, it takes priority

[@haziqahnasir5224]

Ollie Bingham okay thanks😊

[@Apollo-wg1mc]

What if the dash has no label...nothings written on it..just dash attached to the parent chaim

[@raihanurislam7469]

How can we determine R or S for no 2 chiral carbon of glucose.

[@Beowulf-eg2li]

Cheers!

[@alhamdulillah9056]

Can you pls explain the R&S confgration of ergot alkaloid...plss must rply meee

[@Healthy-24]

Best one

[@hal6yon]

Learning RS nomenclature 12 hours before IIT JEE is the weirdest shit I've ever done. Also I didn't know you guys pronounced enantiomers with a hard t.

[@chloetang6694]

@1:35 why do you ignore the hydrogen?

[@jessjms1181]

So for the last one both of them are s?

[@hanaizdihar4368]

in the second example of 2 butanol how to know if the hydrogen is already projecting away?? someone help me..

[@imrupeshs]

Rupesh

[@imrupeshs]

I also want to know this, the only phenomena bounced back 😑

[@mananmehta2320]

If OH is coming out from screen then obviously one hydrogen will be behind as other two carbon attached to it are in plane.

[@abhishekdhakad9826]

why lowest priority group is always kept at the dash line

[@nggaming3877]

Lowest priority group can be place along a plane or above the plane or bellow the plane

[@imranshah3988]

What if the H atom lies in left or right of the chiral centre... Anyone Plz reply

[@saloni6590]

Hey in school we learnt something about (Z) And (E) so is it the same thing or what?

[@woodchuk1]

That deals with trisubstituted or tetrasubstituted alkenes, but it’s still related to stereochemistry in a way. You can’t rotate about the double bond, but the substituents can be oriented so that the highest priority components are on the same (Z) or opposite (E) sides of the double bond.

[@saloni6590]

@@woodchuk1 ily thank you (•ω•`)o

[@NG-xk7fc]

how to give priority to binaphthol

[@yuuotosaka3902]

👏👏👏

[@selinaakter254]

how is it( s) n-butanol ?????????/

[@TheNegativeAngle]

Thank you man...!

[@100d2h]

I have the midterm so fucking soon 😭😭😭😭😭😭😭😭😭😭

[@BlueSkyNoise]

1:34

[@randominternetprofile8270]

BlueSkyNoise Hahahaha. Nice!!!

[@mefatoum1979]

away from the lesson am confused about the pronunciation of "enantiomers"; is it enanTiomers or enanSiomers ?

[@imrupeshs]

Actually Enanshiomers*

[@mefatoum1979]

oh really i didn't know that, i kept pronouncing it enanSiomers throughout the whole year tnx.

[@imrupeshs]

😂 yw

[@opufy]

theyre way too simple i need some with ethenes

[@zwzechul96]

Hi , Dr.Hayek lol

[@hamedhosseini4938]

Hi bae

[@md.nournoby4523]

i cant understand last part of this lecture looking R

[@maxxxlearner7066]

voice quality is poor otherwise nice explanation

[@zayub1009]

Studying for the MCAT and I'm having to relearn all of this smh

[@viplami]

In the first example you say its R and then you take the same example and say its S ... i dont quite get it

[@NoName-ju5ty]

Subtitle indonesia

[@tricksterhighlights8015]

Yoo I was starting to lose hope of understanding this lmao

[@samsunggalagsy1837]

habaltonaaaaaaaaaaaaaaaa

[@Regard7418]

The explanation for the last bit of the video is terrible. There needs to be a better way of describing what to do when the lowest priority group is facing you and how to correct it.