More R,S practice | Stereochemistry | Organic chemistry | Khan Academy

How to assign configurations to a molecule with two chirality centers.
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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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[@aaliyathorpe9057]

This video still saving lives in 2018. Thank you so much.

[@drujjawalrathore]

No one is teaching these high concepts on KZbin. Thanks, you really helped me!!!!!:)

[@Obi1_Kenooby]

I have found that if you don't rotate the molecule so that hydrogen is pointed to the back, and just determine priorities, and get either R or S, the correct answer is the opposite. For instance: I determined the S config of the third carbon by just determining the config of this carbon without rotating, which gave me R. So that means the correct answer is S. I haven't found an example for which this doesn't work, so please let me know if I'm wrong. Sorry if I butchered the explanation.

[@JoannaGiron]

I've been trying to figure this out forever! But your method only works if the lowest priority group is facing out of the page. If the lowest priority group is on the plane of the page, then you have to switch the 4th priority group with the group that is facing behind the page. (redraw this on paper), determine R vs S. But since we changed the absolute configuration/spatial arrangements of the groups, the correct answer is the opposite of that.

[@anitachen-fq3eo]

Thank you so much! from Taiwan

[@xnemer2804]

Thank you very much I really appreciate your efforts.

[@zinahatem7901]

Thank you for this video!

[@chiosarco]

THANK YOU MAN¡¡¡

[@jnb1856]

thank you thank you!

[@monikatiwari3599]

help in vitamins structure eluciadation

[@meriemsdw3531]

thank you

[@mahadihasan7087]

high concept

[@TheScientistsam101]

great video

[@abbassudi192]

Hej Khan at 1.07 you draw a hydrogen that points towards os (downwards). My question is that why couldnt you draw the hydrygen upwards while its still pointing towards us?

[@ramanujraman_]

Dude I’ll be nice if Sal can answer every question on KZbin but unfortunately he can’t, we’ll I don’t know exactly but while doing problems I figured out that it normally mess up the clockwise and anti clockwise orientation. On top of that we are using dash and wedge and if two alkyl groups are already on page then you can’t put third group on the page it has to be going in backward or forward direction here H has to be in forward direction. And I can see you posted this question 4 yrs ago I don’t if it’ll be useful now.

[@hopeodmnc]

How is carbon 3 a chiral center?

[@adityachoudhary4851]

What will be R/S Configuration of but-2-ene in cisform ?

[@manjusingh9118]

Aditya Choudhary jo tumne poocha h Ussme koi chiral center nhi h, uski steriochemistry geometrical isomerism se hogi R, S configuration se nhi.... Hope it helped you... But you should also know that what is a chiral center..

[@gayatribhagwat1267]

questions, does that trick at the end work across the board? Thank you!

[@randomlectureguy5865]

Yes

[@vidhyaar401]

At 5.55 why axis symmetry include ????

[@adityamahesh7928]

Sir but why do we need the hydrogen to move away in space?

[@mythic971]

I really don't get why he writes CH3 as H3C