THANK YOU SO MUCH. My professor taught us how to get the R and S for the simplest molecule, then gave us an extremely complicated one for the exam.. I learned more from you in 15 minutes than I did in 2 hours with my prof.
I must have done some good deed in the past to be able to find your channel. Thank you so much. You are the best chemistry tutor I have ever had the chance to learn from.
you could also tell the difference between R and S by the direction of the arrow and connecting it to the way both letters R and S are written . when writing R you have to go clockwise (the upper part of it) and when writing S you have to go counter clockwise .
Even today, you are saving lives. I might cry because I thought I was dumb, but you really broke it down nicely for me. I don't understand why Ochem professors can't explain it simply like this. Thank you so much.
it frustrates me so much when the people actually PAID to teach you, throw information at you making you feel like you're dumb because they haven't tried hard enough to convey the information. I'm glad to hear that my videos are showing you the opposite
Always happy to help! If you're pre-studying now and are interested in additional help as you go through the class, make sure to check out my Organic Chemistry Study Hall. Details: leah4sci.com/join or contact me through my website leah4sci.com/contact/
I know this was so long ago, but still. thanks Leah. FYI you can always think of it as a steering wheel, pull down to the right to turn right -R and the old term for left-handed was sinister. pull down on the left to turn left -S
Madamme LEAH! You are so much good in Organic Chemistry, You make Hard things in Stereochemistry simple as much a possible, I appreciate You and U always be blessed! Continue by doing so for other courses to help Us enjoy Chemistry or become better Chemists!
This made so much sense. Excellent oratory skills and superb explanations. This was wayyy better than 2 weeks of professor's explanation. Cheers Leah, you're a lifesaver!
Thank you so much !! I was learn so many times but,it does not understand about R and S configration before this lesson .But,now it is very clear thank you once again
Technically the dashes going back should be directly behind the OH group, but then you wouldn't be able to see it. As such it's customary to draw it offset to either side, right or left, to show that it's going away and into the page
I'm sorry, but I don't offer tutoring over social media. For help with questions like this and more, I recommend joining the organic chemistry study hall. Details: leah4sci.com/join or contact me through my website leah4sci.com/contact/
The hydrogen was invisible in the original line structure of 2-butanol. However, since the OH group was on a wedge, the only position left for that invisible hydrogen to be drawn was on a dash in the back of the structure.
the videos keep saying to follow along with the cheat sheet, but each time i try to download the chirality cheat sheet i get a different email with a link that is not the chirality cheat sheet.
I'm sorry, but I don't offer tutoring over social media. If you ever find you need help with questions like this again, I recommend joining the organic chemistry study hall. Details: leah4sci.com/join or contact me through my website leah4sci.com/contact/
Yes and no. We use periodic table trend/atomic number for simplicity. If and only if faced with an isotope you'd look at mass. I say this because sometimes an atom will have lower mass than a previous atom (rare) and because it's more confusing to have to look up the mass when most orgo professors do not include them on exams.
Could you please elaborate" I say this because sometimes an atom will have lower mass than a previous atom (rare)" I still don't understand, you only explained that its best to use atomic number, not mass because exams use it and that its confusing but Im not talking about test taking, no offense It just seems to make sense if atomic mass is used to prioritize. Until you explain please
I'm sorry, but I don't offer tutoring through TH-cam comments. For help with this and more, I recommend joining the organic chemistry study hall. Full details: leah4sci.com/join
I'm sorry, but I don't offer tutoring over social media. For help with questions like this and more, I recommend joining the organic chemistry study hall. Details: leah4sci.com/join or contact me through my website leah4sci.com/contact/
Yes. One goes hand in hand with the other. As atomic number increases, so does an atom's mass. Bigger/heavier groups, whichever way you want to think of it, take priority.
That's strange, I just tried and it's working on my end. Try clearing your cache and sign up for it again. If you still have problems, contact me at leah4sci.com/contact.
THANK YOU SO MUCH. My professor taught us how to get the R and S for the simplest molecule, then gave us an extremely complicated one for the exam.. I learned more from you in 15 minutes than I did in 2 hours with my prof.
You're very welcome, so happy to help!
future pharmacist here. thank you so much!
You are welcome :)
what do u mean
mahadi hasan this was all pretty straightforward...consult a dictionary if you still don't get it :)
Lol same here
hi quick check were you able to become a pharmacist?
BRO THIS TOPIC WAS ALWAYS CONFUSING BUT YOU JUST BROKE IT DOWN SO EASILY I LOVE YOU
Glad you are able to understand the topic well. Don't forget to subscribe! :)
I must have done some good deed in the past to be able to find your channel. Thank you so much. You are the best chemistry tutor I have ever had the chance to learn from.
Wow, thank you!
you could also tell the difference between R and S by the direction of the arrow and connecting it to the way both letters R and S are written .
when writing R you have to go clockwise (the upper part of it)
and when writing S you have to go counter clockwise .
good tip
nolearn to draw s again blud
Even today, you are saving lives. I might cry because I thought I was dumb, but you really broke it down nicely for me. I don't understand why Ochem professors can't explain it simply like this. Thank you so much.
it frustrates me so much when the people actually PAID to teach you, throw information at you making you feel like you're dumb because they haven't tried hard enough to convey the information. I'm glad to hear that my videos are showing you the opposite
My professor makes this look so hard. So the problem is not the topic but the way some professors teach it.
Sometimes we need a different take to understand.
Thank God I found your channel, you videos are literally saving my life, have organic chemistry in two weeks and I am confident I will ace it.
Always happy to help! If you're pre-studying now and are interested in additional help as you go through the class, make sure to check out my Organic Chemistry Study Hall. Details: leah4sci.com/join or contact me through my website leah4sci.com/contact/
I've looked at over 50 of your videos, and I pretty sure you're a genius, at the very least a didactic genius.
Oh wow, 50! I'm honored!! and Thanks so much for the kind words, I love teaching and promise to strive to live up to your 'didactic genius' compliment
THANK YOU LEAH!!! Wow, please never stop this amazing channel! You are clearly one of the best.
You're so welcome! And I have no plans of stopping :)
I know this was so long ago, but still. thanks Leah.
FYI you can always think of it as a steering wheel, pull down to the right to turn right -R
and the old term for left-handed was sinister.
pull down on the left to turn left -S
You're welcome! Great tip for memorization. :)
Thank you! I was confused for about an hour, but after seeing your video, I get it now.
Awesome! Glad it helped!
U did very awesome! Absolute genius! I'm facing so much problem with this topic now u cleared me perfectly! Thanks a gallon!
Awesome, so glad it helped!
Madamme LEAH! You are so much good in Organic Chemistry, You make Hard things in Stereochemistry simple as much a possible, I appreciate You and U always be blessed! Continue by doing so for other courses to help Us enjoy Chemistry or become better Chemists!
Wow, thank you! Happy to help!
This made so much sense. Excellent oratory skills and superb explanations. This was wayyy better than 2 weeks of professor's explanation. Cheers Leah, you're a lifesaver!
You're so very welcome, happy to help!
Outstanding explanation of difficult topic!
Amazing work
This channel must have millions of subscribers!
Not yet, but I care about all my subscribers and strive to help the understand (and dare I hope love) orgo!
BRILLIANT VIDEO!!!! Never could understand this but you explained it in one video and I understand it now! Woohoo!!!!
Awesome!!!
U r Awsm mam. before watching this video R&s to found more difficult for me but now its very easy ...Thank u so much
🙏🙏🙏🙏🙏
You're very welcome!
You're more than genius, keep it up my madam!!!
Thank you!! :)
Respect to u from India... U r awsome mam... making it easy for me..
You're welcome!
Your teaching is amazing 🤩
Thank you! 😃
Thank you so much !! I was learn so many times but,it does not understand about R and S configration before this lesson .But,now it is very clear thank you once again
Glad I could help! You're welcome
Madam you have great explanation you have cleared all my doubts thank you so much
You're welcome!
thank you, most simplest and most concise terms of any of the videos i've seen on this topic
You're so welcome!
Your teaching is excellent 🦋🥰♥️
Thank you! 🙂
Thank you.. i gained much than when i was in class
I'm so glad that you found the video helpful!
AT 11:53 does it matter where you place the hydrogen atom? For instance would there be any difference if you draw to the left of OH? Thanks
Technically the dashes going back should be directly behind the OH group, but then you wouldn't be able to see it. As such it's customary to draw it offset to either side, right or left, to show that it's going away and into the page
but what will be the priority order if the chiral carbon has a ethyl group and a ethenyl group?
when there's a multiple binding you double/triple (depending if it's double or triple bond) the number of particles that are connected to the c
I'm sorry, but I don't offer tutoring over social media. For help with questions like this and more, I recommend joining the organic chemistry study hall. Details: leah4sci.com/join or contact me through my website leah4sci.com/contact/
Simple yet amazing way
I hope you found it clear and helpful!
thanx ...med student in Jordan university
You're very welcome!
Thank you so much, Ms. Leah; I appreciate you.
You are so welcome!
Thank you so much even my class teacher won't explained me as easier as you explained...
You're welcome, I'm so happy to help clear things up for you!
Good explanation, Keep it up!
Thank you and I'll try :)
you're a life saver ❤❤thank you so much
Awww, you're so welcome!
So helpful to me thanks a million ❤
Happy to help and you're very welcome!
I didn't understand it in class
But you just made it easier for me
Love you more😘😘
Glad the video helped you understand the topic better! You are very much welcome!
Viewer from Arab Republic of Egypt
Awesome! Welcome to my channel!
hi, i know this was posted a while ago, but on the last example, what made you decide to put the Hydrogen in the back?
The hydrogen was invisible in the original line structure of 2-butanol. However, since the OH group was on a wedge, the only position left for that invisible hydrogen to be drawn was on a dash in the back of the structure.
Your explanation is clear and systematic 👍🏻 Thank You So Much
You are welcome!
Leah! you're my savior !:) thank you so much for your help! have a great day
Awww, you're so welcome!
Omg thank you so much...so simple and informative
Glad it was helpful!
Thank you very much!!! Your channel was really helpful.
Thanks for visiting. Don't forget to susbscribe!
Thankyou mam
Love from india .😍...very helpful
Glad it helped!
5 yrs ago I was preparing for medschool exams and today after I saw your reply I am passed out from med school. Time flies
the videos keep saying to follow along with the cheat sheet, but each time i try to download the chirality cheat sheet i get a different email with a link that is not the chirality cheat sheet.
That shouldn't be happening, email me so I can figure out what's going on. Leah4sci.com/contact
If they give you a complicated compound and asked you to find the stereo centre, how would you ID them ? For example morphine
I'm sorry, but I don't offer tutoring over social media. If you ever find you need help with questions like this again, I recommend joining the organic chemistry study hall. Details: leah4sci.com/join or contact me through my website leah4sci.com/contact/
Literal perfection!
Thanks!
your videos are amazing thanks a ton.
You're welcome! Glad to help! :)
Amazing explanation!
Glad it was helpful!
Thanks mam ,you are doing a great job ,teacher= god 🤗
You're welcome ! :)
Do I have to pay to download your worksheets?
Are you referring to the cheat sheets? If so, they are free :)
THANK YOU SOOOO MUCH！！ you are my god❤
You're very welcome, but just a person, not a god. I don't want to be in control of that much! ;)
This video was so helpful, thank you so much !
Glad I could help!
So the ranking is based on atomic mass right? Not reactivity?
Neither! atomic number
You are awesome! please keep making more videos
Thanks! I sure will! be sure to subscribe to the channel :)
Thanks
This video helped me to understand r s configuration.....
You're welcome, happy to help!
thanks a lot, this was very helpful lecture. i think my professor prepared from your video but did not convey that good. ;-) , once again thanks.
You're very welcome! I'm glad to hear my video made it clearer for you.
is it necessary to draw fischer projection before assigning configuration?
Yes, chan golden perlog system is also important for drowing fisher projuction
Not at all. Only draw it if you're asked to, otherwise use the tricks I teach for various conformations to solve for R/S however you see it
How wonderful you had been doing as well I'd liked ur style in explication keep going on
Thank you, I will :)
Great trick..thanks a lot for sharing this🖒
You're welcome! Feel free to share the video/channel :)
Thanx a lot you have made the lesson interesting
You're welcome!
you are an idol mam.. loved ur vedios
Glad you've enjoyed them :)
u r just the best.... bless u!!! Leah
Aww thanks!
your videos are really awesome
Thank you!
Thank youuuu sooo much maammm
you're very welcome!
So because of isotopes its BEST TO PRIORITIZE THE NUMBERING USING ATOMIC MASS making it more consistent??????
Yes and no. We use periodic table trend/atomic number for simplicity. If and only if faced with an isotope you'd look at mass. I say this because sometimes an atom will have lower mass than a previous atom (rare) and because it's more confusing to have to look up the mass when most orgo professors do not include them on exams.
Could you please elaborate" I say this because sometimes an atom will have lower mass than a previous atom (rare)" I still don't understand, you only explained that its best to use atomic number, not mass because exams use it and that its confusing but Im not talking about test taking, no offense It just seems to make sense if atomic mass is used to prioritize. Until you explain please
Can you please make a video on M and P configuration
I don't know what that is
I love her voice
Thanks!
Thank you so much!!!!!!♥️♥️♥️♥️♥️
You are so welcome!
Why do I remember hearing that you can only determine absolute configuration experimentally?
Absolute configuration is R/S. Perhaps you're thinking of relative configuration?
that was reaaaly helpful .thank u so much 😍😍
You're welcome, happy to help!
Thank you so much. This was super helpful!
You're so very welcome, happy to help!
Perfect thank you! From Germany
You're welcome!
What if wedge and dash are not given?just simple lines then what should be done...can R and S be found?
If not given in 3-D then you have no way of knowing. Meaning, it could be both
@@Leah4sci Wow!.....was not expecting a reply 3 years later!
I already gave up on chemistry, still...Thank You. Some of your videos helped me.
What if i have a primary carboxylic acid and primary alcohol attached to the chiral carbon?
I'm sorry, but I don't offer tutoring through TH-cam comments. For help with this and more, I recommend joining the organic chemistry study hall. Full details: leah4sci.com/join
Please help with naming the compound
I'm sorry, but I don't offer tutoring over social media. For help with questions like this and more, I recommend joining the organic chemistry study hall. Details: leah4sci.com/join or contact me through my website leah4sci.com/contact/
tq ....mam u r clear my doubts.
Glad I could help!
Leah4sci.great explanation
Thanks! :)
Thank you leah🤗
You're very welcome!
this helped so much omg thank you !!!!
I'm so glad!
NICE video madam and good luck
Thank you very much
Really helpful.
Thanks alot .
You're amazing
You're welcome 😊 Happy to help!
Really helpful and easy to understand
So happy to help!
thank you so much Leah!
You are welcome!
Thanks a lot..that has really helped me
You're so very welcome!
Thank u Ma'am
You're welcome 😊
Good explaination
Glad you liked it!
you said we rank by atomic number in the first few minutes, dont we rank by mass?
Yes. One goes hand in hand with the other. As atomic number increases, so does an atom's mass. Bigger/heavier groups, whichever way you want to think of it, take priority.
Nice video 👍👍👍
Thank you!
wonderful it's make very easy to understand me soo thanks fisch
So happy to help!
Very helpful!!! thank you :)
You're welcome!
I can't access the book
That's strange, I just tried and it's working on my end. Try clearing your cache and sign up for it again. If you still have problems, contact me at leah4sci.com/contact.
thank you so much you help me 😢❤️
You're so welcome!
thank you so much ....i'm addicted to you
Too funny! You are very welcome
thank you so much!!! helps me a lot!
You are very welcome!
thanks so much
l love you😘😘😘
you're very welcome!
God bless you!!!
Thank you so much!
Thankyou so much❤
you are so welcome
I finally understand, thank you
You're welcome!
You said there are 4 conditions of #4 but you didn't explain it! .... I want to know the #4 which is not fwd/back . thank you
at which specific point in the video? (Timestamp please)
Thank u so much
From algeria
You're very welcome!