Stereochemistry - R S Configuration & Fischer Projections

Рет қаралды 1,154,770

3 жыл бұрын

This video provides an overview of the stereochemistry of organic compounds and defines what exactly a chiral carbon center is. This video also shows you how to assign R and S configuration to a chirality center whenever the hydrogen (4th group) atom is in the front, back, or neither. It also discusses nomenclature - how to name organic compounds using R and S absolute configuration. It provides a lot of examples and practice problems.
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@TheOrganicChemistryTutor 2 жыл бұрын

Organic Chemistry PDF Worksheets: www.video-tutor.net/orgo-chem.html Full-Length Exams & PDF Worksheets: www.patreon.com/MathScienceTutor/collections Direct Link to The Full Video: bit.ly/3sYktse PDF Worksheet - 38 Sub-Problems: bit.ly/3HaeWas

@realndu 2 жыл бұрын

Thanks Man! Hope to get a like :)

@Curiousviewer23 Жыл бұрын

In minute 17:00 shouldn't there be 9 chiral centers and not just 8. I am referring to the carbon under the second carbon that you numbered. Isn't that also a chiral center since it is attached to 4 different groups?

@macysnatural8144 Жыл бұрын

@@Curiousviewer23 I thought the same too but I just goggled for the structure of cholesterol and he has the wrong structure....the particular c you speak of own the double bond too that was put away

@sammuelboateng282 Жыл бұрын

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@user-tq9pp9xh6u 10 ай бұрын

@@Curiousviewer23 samee!!! Doubt

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@mimiloula4723 2 жыл бұрын

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@courageagbanyo8091 2 жыл бұрын

me 4

@elizabethnjoroge5034 2 жыл бұрын

Me 5🥳

@satyarajshivareddypeta613 2 жыл бұрын

just curious, is this taught in high school or college in your country

@user45601 2 жыл бұрын

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@amdkits Жыл бұрын

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@hexcoff1689 10 ай бұрын

Same here

@nightmarefredbear7739 3 жыл бұрын

Ah,lets learn stereochemistry at 1 AM

@rubenfigueroa1063 3 жыл бұрын

12:34am tonight

@aformula4198 3 жыл бұрын

5:45 Am

@rubenfigueroa1063 3 жыл бұрын

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@icarus5676 2 жыл бұрын

3:10am

@legenarymaster3696 2 жыл бұрын

12:48am

@saraparrish3756 Жыл бұрын

TY, I appreciate all your hard work. I watch many of your videos and they have helped a lot! ***Possible CORRECTION? looks like the cholesterol molecule in your video has the double bond in the wrong place. *** I kept going over and over this and could not understand why Carbon-5 (the one due south of the methyl group) was not a chiral center? As the figure is drawn, it should be...which would make 9 stereocenters, not 8. But when I looked up cholesterol, the double bond is actually between C-5 and C-6 not as you've shown it. Just in case anyone else got stuck on this problem.

@yevheniiavelihina1197 Жыл бұрын

Same for me

@DrTuph 11 ай бұрын

Thanks for this comment. I've been sitting here the past few minutes trying to figure out why there would only be 8 given the drawing in the video. After looking up what cholesterol should look like, it makes sense.

@boatman3132 11 ай бұрын

I have struggled for this question as well until I found out your comment. It seems that there are 2^9=512 different stereoisomers in cholesterol.

@dukeaboagye3099 8 ай бұрын

thanks can't believe I realized it

@pfelixtutor8738 7 ай бұрын

I saw that too, the double bond is in a wrong position. All the same thank you 🙏

@paulnegoita5769 3 жыл бұрын

17:08, isn't there another chiral center below carbon #2, since first bond goes to a sp3 C, second to sp3 CH2, and third to a sp2 CH and a hydrogen?

@FBWUniverseMode 3 жыл бұрын

yess there are 9 not 8 chiral Cs

@oluwajobipeterpelumi1279 3 жыл бұрын

Brilliant you are correct.. Wanted to ask too

@xeel224109 3 жыл бұрын

Yes, he drew the molecule with the double bond in the wrong place. Cholesterol has 2^8 isomers but the drawn molecule has 2^9.

@n_7458 2 жыл бұрын

He made a small error and drew the double bond in the wrong place. So, you're right that the molecule shown has 9 stereocenters! In reality, cholesterol only has 8. You can confirm this by googling the molecule. xx

@Scifiotica 2 жыл бұрын

@@xeel224109 Oh thanks I thought I had lost it there! Now it makes sense.

@junovalentines3304 9 ай бұрын

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@michaelc2946 Жыл бұрын

the double bond in the cholesterol is incorrect. it needs to be moved one bond to the left. I kept thinking there were 9 chiral centers until I googled it. Keep up the great work!!

@wdzcix Жыл бұрын

i was so confused on that lol

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@PunmasterSTP 2 жыл бұрын

Another incredible video; thanks so much for posting! If the hydrogen (or lowest priority group) isn't where I want it to be, sometimes I just exchange two groups to make that happen, and remember that that inverts the stereochemistry (R -> S or vice versa).

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@SidneyFlo Жыл бұрын

When identifying the chiral centers on cholesterol, I think you accidently missed one and it would be 9 instead of 8. Isn't there a chiral center on the carbon below the one you indentified as 2?

@XQJimmy 5 ай бұрын

You are right! Based off of his structure, there are 9 chiral centers. However, the double bond in his cholesterol drawing is in the incorrect position; it should be moved one spot to the left. After that change, there will only be 8 chiral centers

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@nathanmanning3816 9 ай бұрын

For Q3, the one assigning chiral centers for Cholesterol, would there not be a chiral carbon just below the 2nd chiral carbon? It is attached to a sp2 hybridized carbon, the carbon with a methyl group, and a ch2 carbon that eventually leads to an alcohol

@ayaansurti2876 9 ай бұрын

yes, it is chiral so there are 9 chiral centers

@felipetabareguicheneyvicen68 7 ай бұрын

Yes, he drew the double bond incorrectly, the two cicle hexanes are supposed to be "fused" via a double bond between the carbon under chiral carbon 2 and the carbon to it's right, so in the cholesterol molecule there are only 8 chiral centers, but the molecule shown in the video has 9 chiral centers.

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@user-ic9hj2tr9e 7 ай бұрын

The position of the C=C in cholesterol is wrong, according to your drawn diagram, there should be 9 chiral centers, but for cholesterol, there is only 8 because of the positioning of the C=C. But other than that, I loved the video and it helped me a lot in understanding stereochemistry.

@debjaneechowdhury2763 2 жыл бұрын

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Thank you sir

@carolinnicolai615 3 жыл бұрын

I've got a question regarding the Hydrogen Atoms in the Cholesterol Molecule. Did you follow any rules when placing the Hydrogens in between the Carbon structure regarding their position behind or in front of the planes? Or is their position arbitrary? Thank you so much for this great tutorial. It really helps!

@seungminned0922 Жыл бұрын

Can anyone answer this? I wanna know too. Thank you to the one who will answer.