5.4 Fischer Projections | Organic Chemistry

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[@ChadsPrep]

Excellent, viktoria - keep up the hard work!

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Glad to hear it, Steven!

[@quinnpuffer7901]

You do an amazing job at using common words to describe what's going on rather than overly complicating the material trying to be learned

[@ChadsPrep]

Thank you - glad you think so!

[@nilsnickname4455]

Very great explained. I studied more than 10 semesters teached by (more than 5) many profs. I just want to refresh knowledge. No one explained it nearly as good as you. Great! When rotating the Fischer-projection by 90° all stereocenters change I guess. Also when you flip it over.

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[@ChadsPrep]

Glad the channel is helping you - Happy Studying!

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[@user-pj5bk7ds8u]

Thank you for the explanation and constraint of Fischer projection

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You are most welcome.

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[@ChadsPrep]

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[@HowTo-ly9cm]

Hello. I'm still confused on how you convert the chemical formula of glucose into Fischer projection. Can you please explain to me.

[@min_g2608]

Hi Chad, can you please explain how you prioritized carbons 2 through 5 (4:55 and on)? Carbon 1's numbering makes sense because of the carbonyl, but the others don't (especially which atoms get assigned priority 2 and 3)

[@sciencenerd7639]

Fischer projections, a rolodex of chiral centers that just wanna reach out and hug you

[@ChadsPrep]

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[@giraffegorawr]

Definitely makes it enjoyable!

[@ChadsPrep]

Glad to hear it!

[@Iman-rx8ho]

Well done

[@ChadsPrep]

Thanks

[@justindong7199]

how did you know to draw the OH on top and bottom like that? For example: carbon #2 if I drew the OH on the bottom, that would change the R and S right?

[@ChadsPrep]

Hey Justin! which example (time) in the video is this about?

[@morderi40]

you're a life saver

[@ChadsPrep]

Excellent!

[@asmamuhammad2174]

Than you so much

[@ChadsPrep]

You are welcome, Asma.

[@asmamuhammad2174]

@@ChadsPrep sorry but I have question how can l convert bond line structure to Fischer projection?

[@saimoon4232]

The C in COOH, shouldnt it be 2 since C has 00H (double bond Oxyden will count as two O atoms??)

[@ChadsPrep]

Hey Saimoon - do you mean priority? Is this about a specific time in the video?

[@saimoon4232]

@@ChadsPreplike at 4:34, you put OH on 1 st priority and not COOH

[@ChadsPrep]

@@saimoon4232 we assign priority 1 based on the highest atomic number of the atom directly attached to the chiral carbon. The OH gets 1 because O has a higher atomic number than carbon. Then we have a choice between 2 carbons, one has 2 bonds to the oxygen so gets 2, the other carbon at the bottom has an OH group so gets three. Note that the direct attachment to O preceeds over COOH or C(OH)H because the first atom attached in each of the latter is a carbon. I hope that helps!

[@saimoon4232]

Thanks alot for the fast reply.That makes sense. @@ChadsPrep

[@ChadsPrep]

@@saimoon4232 Most welcome.

[@monpetitgarcon]

@4:59 re: second chiral centre, why the C on the top is second versus the C down the bottom? Same goes onto the 3rd and 4th chiral centre? Someone please help 😭

[@diamondbennett4005]

wondering this too since the bottom one had an OH that was closer

[@yk3315]

double bond to oxygen is greater priority

[@jessicataylor6813]

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Glad the videos/channel is helping you out!

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[@injhs]

4:56 I don't get why you are switching R and S

[@ChadsPrep]

That top carbon is R because the OH --> COH --> C(H)OH priority is making a right turn into the plane of the screen whereas the second carbon is S because we have a left turn. Watch this video if its still unclear kzbin.info/www/bejne/pGrQiImDZbibis0