5.4 Fischer Projections | Organic Chemistry

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Chad introduces Fischer Projections and explains how they give us a little different perspective on viewing chiral centers which is convenient for molecules with many chiral centers like sugars (monosaccharides). In a Fischer projection, the horizontal bonds correspond to wedges and the vertical bonds to dashes in the corresponding bond line structure. Chad then draws the Fischer projection of glucose and shows how to assign R and S configurations to the chiral centers in the Fischer projection of glucose. Finally, he shows how to convert Fischer Projections to Bond-Line Structures how to convert bond-line structures to Fischer projections.
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00:00 Lesson Introduction
00:39 Introduction to Fischer Projections and Drawing Fischer Projections
02:57 Assigning R & S Configuration to Fischer Projection
05:59 Drawing bond Line Structures from Fischer Projections
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Пікірлер: 52

@viktorialeonard5630 3 жыл бұрын

You are the sole reason I passed some of my undergrad classes and I am back for DAT prep 🤩

@ChadsPrep 3 жыл бұрын

Excellent, viktoria - keep up the hard work!

@ChadsPrep 3 жыл бұрын

I almost forgot; did you see my DAT practice exams that are currently available free of charge?😊 courses.chadsprep.com/courses/chads-dat-practice-exams

@nilsnickname4455 9 ай бұрын

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.

@stevendoan4676 2 жыл бұрын

I am trying to study ochem by myself with no prior knowledge and you are making the process quite easy and enjoyable! great work!!

@ChadsPrep 2 жыл бұрын

Glad to hear it, Steven!

@quinnpuffer7901 8 ай бұрын

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 8 ай бұрын

Thank you - glad you think so!

@leilinajafi-lr7zj 5 ай бұрын

Thank you so much for the videos :) Having no knowledge of organic chem, your videos are only thing that are taking me through DAT. 🥰

@ChadsPrep 5 ай бұрын

Glad the channel is helping you - Happy Studying!

@MuhammadArshad-ut1tq 2 жыл бұрын

Your such a great teacher wish u were at my university.

@ChadsPrep 2 жыл бұрын

Thanks!

@user-pj5bk7ds8u 3 ай бұрын

Thank you for the explanation and constraint of Fischer projection

@ChadsPrep 3 ай бұрын

You are most welcome.

@giraffegorawr Жыл бұрын

Definitely makes it enjoyable!

@ChadsPrep Жыл бұрын

Glad to hear it!

@quinnpuffer7901 8 ай бұрын

Awesome video. You remind me of my first chem professor who was absolutely stellar

@ChadsPrep 8 ай бұрын

Excellent!

@HowTo-ly9cm Жыл бұрын

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

@morderi40 Жыл бұрын

you're a life saver

@ChadsPrep Жыл бұрын

Excellent!

@Iman-rx8ho Жыл бұрын

Well done

@ChadsPrep Жыл бұрын

Thanks

@sahilkhan-ix1ui 9 ай бұрын

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@ChadsPrep 9 ай бұрын

They see me mowin' My front lawn I know they're all thinking I'm so white 'n' nerdy

@min_g2608 2 ай бұрын

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)

@asmamuhammad2174 3 жыл бұрын

Than you so much

@ChadsPrep 3 жыл бұрын

You are welcome, Asma.

@asmamuhammad2174 3 жыл бұрын

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

@sciencenerd7639 2 жыл бұрын

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

@ChadsPrep 2 жыл бұрын

👍

@justindong7199 Жыл бұрын

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 Жыл бұрын

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

@bushraalsulaiman4343 Жыл бұрын

👍👏

@ChadsPrep Жыл бұрын

Thank you!

@monpetitgarcon Жыл бұрын

@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 Жыл бұрын

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

@yk3315 Жыл бұрын

double bond to oxygen is greater priority

@JohnDoe73736 9 ай бұрын

A true chad

@ChadsPrep 9 ай бұрын

Happy Studying

@saimoon4232 7 ай бұрын

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

@ChadsPrep 7 ай бұрын

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

@saimoon4232 7 ай бұрын

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

@ChadsPrep 7 ай бұрын

@@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 7 ай бұрын

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

@ChadsPrep 7 ай бұрын

@@saimoon4232 Most welcome.

@Crazymachin3gun 6 ай бұрын

that eye u drew is spooky lol

@ChadsPrep 6 ай бұрын

Bwahahahahah!!!!

@jessicataylor6813 9 ай бұрын

Thank you for your videos!!!!! I watch them before my lecture class and then the lecture actually makes sense! My professor doesn’t write anything on the board 🥲

@ChadsPrep 9 ай бұрын

Glad the videos/channel is helping you out!

@injhs 9 ай бұрын

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

@ChadsPrep 8 ай бұрын

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 kzfaq.info/get/bejne/pJ-dirl-lbnMhJ8.html