Fischer projection practice | Stereochemistry | Organic chemistry | Khan Academy

How to assign configurations to chirality centers from a Fischer projection.
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[@ErosomArt]

Am a french Medicine student and you helped me for the exams which are coming in 2weeks! Thank you so much !

[@priyanka__verma]

I really loved all three videos of R,S configurations. Really helped me a lot. Awesome explanation. Keep doing good work.

[@lazymoon5794]

Thank you so much!!!

[@manveenkaurwalia5375]

Amaazzingg amazzing explainations!!!!tysm!

[@simplyprecious3128]

Thank you for the video, it really helped.

[@MichaelMaherMusic]

man , you saved my life thank you

[@ALMLSAN]

why did you do the 'bow tie' on the second carbon and not the third? they are both chiral carbons.

[@Everything-qn4mj]

Love you 😘

[@tomascarena6591]

i got a question, i hope you see this comment, if the horizontal lines means its coming at you then if the H and OH of the second carbon are coming at you that means that means the H and OH of the third carbon should be going inside the screen not ot the same side of the second carbon becouse the two carbons should have a tetraedrical shape. i hope you can gasp what im trying to say my english is prety bad

[@stevenwatson2220]

This model doesn't actually follow the correct geometric configuration. The carbon backbone is essentially a straight line with the top and bottom carbons going away from you. Then all the constituents are rotated on their carbon to face towards you.

[@tomascarena6591]

steven watson thanks

[@kiaragandhi5284]

The group at the bottom is CH2OH but you drew it as C2OH?

[@eseusifo2834]

Kiara Gandhi it will still give you the same thing

[@fredfan1122]

I love you

[@footballmakemagic9458]

I don't understand the meaning of It looks like (S) but it is actually (R) please answer me..

[@stevenwatson2220]

In order to assign R and S configuration, the lowest priority group needs to be facing away from you. Due to the nature of this model, all the constituents are actually facing out towards you. So if the lowest priority group is on a horizontal line, it is facing toward you. So instead of trying to reconfigure the molecule in your mind to get the low priority group away, just assign the opposite R and S than what it appears to be. If the low priority group is in the vertical line, than the apparent configuration is correct.

[@sagarikabanerjee6539]

your voice is inaudible

[@bluecheesybob]

Your comment is invalid. I can hear him very clearly. Check your speakers.