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I've been getting consistent 40s and 30s on exams and quizzes in my organic chemistry class, and after taking notes of all of your videos I finally got my first 95 on an exam:,) thank you so much, I really do appreciate it
enantiomers have opposite configurations at all chirality centers, whereas diastereomers have opposite configurations at some (one or more) chirality centers but the same configuration at others.
Wedge just means it's facing toward you on the page of the plane. The priority is all about the atomic number or Proton number of thr atom. Br has a higher atomic number than say methyl or hydrogen so it's more of a priority
From what I understand, a compound can only have 1 enantiomer. But, for the last problem with trans-1,2-dibromocyclohexane (pretty sure I butchered the naming), you drew 2. Are they the same?
I think I answered my own question. If you rotate one of them, it matches the other. They’re the same, just draw differently. I just need to figure out the wedges and dashes🥴
@@serena_bee No that is not correct. RS configurations have nothing to do with + or - molecules. The only way to determine whether the molecule is + or - is to put the molecule sample into a polarimeter to measure which way the plane polarised light rotates. RS configurations is just a way to express what kind of enantiomer you're referring to so that others know what you're talking about without measuring the optical activity of the molecule.
I would say there is no easy way to distinguish between enantiomers of 2-amino butane. The only way I could think of is to measure their optical activities in a polarimeter but this only works if you have two separate samples of the enantiomers. It doesn't work if you have a racemic mixture.
You reverse it because you want the CH3 (or whatever is higher than H) on the dashed block to go on the wedge and then you swap the configuration since you're taking H to the back.
There are two steps to assigning configurations to stereogenic centres: step 1: assign priority based on the atomic number of the attached atoms (e.g. Bromine is labelled as priority one at 1:30 and hydrogen is priority 4) step 2: orientate the molecule so that the lowest priority atom (usually hydrogen) is at the back, furthest away from the viewer (this position is represented by the dashed bond)
So in this case, its kind of like imagining that the mirror is in front of the molecule. The Bromine which was on a wedge i.e. in front of the plane would appear to be behind the plane in the mirror. Hence why it is on a dash and is not on the left side of the molecule.
also because stereoisomers have same connectivity so if the bromine is on the second carbon, then in the other enantiomer it must stay on the second carbon (pretty sure this is correct info)
But you all start drawing it straight in Fischer or perspective but how do I convert it from CH3ChBrCH2OH to Fischer or perspective formula something like this
1:11 Aren't they meso compounds? I don't believe they are enantiomers, because if we assume there is a mirror in front of the compound on the left, it should have a mirrored image, implying the chiral chain that is on the backwards now should be on the front and vise versa, while those who are neither front or back should be the way they are.
These are not meso compounds. The mirror plane identification for meso compounds has to put the plane within the molecule. There are no planes of symmetry in the molecule.
at 5:40 why would there only be one enantiomer instead of 4? shouldnt there be RR, RS, SR, and SS enantiomers if the original compound has two chiral centers?
You can’t have 4 enantiomers by definition, only ever 1. SS would be the enantiomer of RR, SR would be the enantiomer of RS. One of these pairs may be meso, depends on the compound.
I know I am 4 months late but just switching the wedges and dashes on the carbon chains is like what he did in the previous problems but now he is doing it without using a "mirror". I find it helps when I use a 3D model.
It’s not because for a tetrahedral carbon to be a chiral center it has to have 4 different substituents. The carbon in the methyl group is bonded to 3 hydrogen atoms, which are not different, therefore it is not chiral
Sure if you’re drawing it as if a mirror was there. But then flip that over and you get exactly what he drew. Enantiomers have all stereocentres with the opposite configuration which he drew, so it’s valid.
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I've been getting consistent 40s and 30s on exams and quizzes in my organic chemistry class, and after taking notes of all of your videos I finally got my first 95 on an exam:,) thank you so much, I really do appreciate it
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Can u please share notes?
Thank you so much for the work you do. I'm currently enrolled in an 8 week summer Organic Chemistry class. Your videos have saved me!
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Only videos I actually hit the like button to support. Hes the Chem god
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my chemistry professors (not orgo) is making us learn this stuff.... you gotta be kidding me. At least it makes it easier, thanks
first time i understood that you can either switch the wedges and dashes OR do mirror image. thank you!!
me too! I was so confused
thank u...The video really helps.
Oh my goodness girlfriend! So good! You helped me with IB HL Chemistry! I will totes recommend you to my besties!
I finally understand enantiomers, thank you very much!!
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enantiomers have opposite
configurations at all chirality centers, whereas diastereomers have opposite configurations at some
(one or more) chirality centers but the same configuration at others.
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Why is the Br on the wedge? Does the wedge always go to the highest priority compound?
Wedge just means it's facing toward you on the page of the plane. The priority is all about the atomic number or Proton number of thr atom. Br has a higher atomic number than say methyl or hydrogen so it's more of a priority
You are the best
Im in highschool chem and learning for fun. I love chem.
Man. I love your work.
How do I know if i should use th wedge or lines?
when do we swap the dot with the wedge and vice versa?
Finally I understood
Thxxx!! finally understand!! 😭😭😭
From what I understand, a compound can only have 1 enantiomer. But, for the last problem with trans-1,2-dibromocyclohexane (pretty sure I butchered the naming), you drew 2. Are they the same?
I think I answered my own question. If you rotate one of them, it matches the other. They’re the same, just draw differently. I just need to figure out the wedges and dashes🥴
How can you distinguish between the 2 isomers 2-amino butane? What makes one + and the other - ? Thank you!!
R configuration is (-) and S configuration is (+).
@@serena_bee No that is not correct. RS configurations have nothing to do with + or - molecules. The only way to determine whether the molecule is + or - is to put the molecule sample into a polarimeter to measure which way the plane polarised light rotates. RS configurations is just a way to express what kind of enantiomer you're referring to so that others know what you're talking about without measuring the optical activity of the molecule.
I would say there is no easy way to distinguish between enantiomers of 2-amino butane. The only way I could think of is to measure their optical activities in a polarimeter but this only works if you have two separate samples of the enantiomers. It doesn't work if you have a racemic mixture.
@@w07106123 good work lol
Please do the enantiomers for estradiol 🥺
Well done. Activation Mechanisms of the NMDA Receptor in relation to enantiomers=interesting
hello u are awesome!! I cant understand why we have to reverse the hydrogen which is in the front and change tha configuration..thanks
You reverse it because you want the CH3 (or whatever is higher than H) on the dashed block to go on the wedge and then you swap the configuration since you're taking H to the back.
There are two steps to assigning configurations to stereogenic centres:
step 1: assign priority based on the atomic number of the attached atoms (e.g. Bromine is labelled as priority one at 1:30 and hydrogen is priority 4)
step 2: orientate the molecule so that the lowest priority atom (usually hydrogen) is at the back, furthest away from the viewer (this position is represented by the dashed bond)
At 5:56 Why it is not like that: bromine is on the left side of the top of the structure, if it is mirror immage, it should be like I said?
So in this case, its kind of like imagining that the mirror is in front of the molecule. The Bromine which was on a wedge i.e. in front of the plane would appear to be behind the plane in the mirror. Hence why it is on a dash and is not on the left side of the molecule.
also because stereoisomers have same connectivity so if the bromine is on the second carbon, then in the other enantiomer it must stay on the second carbon (pretty sure this is correct info)
So a enantiomers is a non superimposable mirror image which has a chiral carbon
But you all start drawing it straight in Fischer or perspective but how do I convert it from CH3ChBrCH2OH to Fischer or perspective formula something like this
1:11 Aren't they meso compounds? I don't believe they are enantiomers, because if we assume there is a mirror in front of the compound on the left, it should have a mirrored image, implying the chiral chain that is on the backwards now should be on the front and vise versa, while those who are neither front or back should be the way they are.
These are not meso compounds. The mirror plane identification for meso compounds has to put the plane within the molecule. There are no planes of symmetry in the molecule.
Propan-2-ol does not have a chiral center but in our books it's given that they are enantiomers is it correct??
If it doesn’t have a chiral centre it doesn’t have an enantiomer.
Hi OCT..does this mean we can't exchange two line bonds to get an enantiomer?
I already did that in my test 😢
why when doing an enantiomer of bromine, we don't create a line of symmetry and create a mirror image? we just switch it to a dash?
There’s more than one way of drawing enantiomers. You just need to rotate what you’re thinking about in your head.
do all chirals change in an enantiomer?
why did you start swapping the wedge and dashed substituents toward the end of vid? isn't it just mirror image so it still would be on the same side?
For the last example, wouldn't that enantiomer also be a diastereomer?
at 5:40 why would there only be one enantiomer instead of 4? shouldnt there be RR, RS, SR, and SS enantiomers if the original compound has two chiral centers?
Yeah he is just teaching the basic level but you're correct
You can’t have 4 enantiomers by definition, only ever 1.
SS would be the enantiomer of RR, SR would be the enantiomer of RS. One of these pairs may be meso, depends on the compound.
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Love it thanks for the good video mate
Why we need to reverse when H is in the front?
What is the name of the molecule?
thank you for your help!
Thank you! But I don't understand the wedge and dash thing
Is there a video on it I could refer to?
No
Wedge = Facing towards you, Dash = Facing into the page. Its a way of showing 3D molecules in 2D space
NotaPro Thank you 😊, I truly appreciate it
I knew that 2
Brian Shang shut up Brian
Where did we get the rule that if he is in the front we reverse the counting?
What are ths the two enantinomers of Cocl2 (en) +2
how do you know how to draw them when youre given the the formula?
I can draw the other enantiomer given one of them, but how do you know where to put from the formula?
If R or S configuration is given eith the formula then it's possible to draw their structure
If not you cannot 😄 hope I solved
Bro is goated
at 6:30 should we not put cl first then br?
thank you sir!!!!!
I think in 4:17 there is something wrong
Compound in right side should be S not R ?!!
H is in front plane so we take R instead of S
As always thank you so much!!!
wtf? why does those the configuration change depending on the how H is facing? im talking about the example at 4:08
Thank you!!
Thank you!
at 5:45 i get confused now u covert the wedges and dashes but earlier on examples you never why? ITS CONFUSING ME PLEASE HELP
I know I am 4 months late but just switching the wedges and dashes on the carbon chains is like what he did in the previous problems but now he is doing it without using a "mirror". I find it helps when I use a 3D model.
How do you convert it from it's normal structural formula to either Fischer projection or prospective formula. That's where the issue is for me
Isn't it like CH2CH3 (opposite) H3CH2C at 5:35 ?
I'm watching this now and I've got the same question
It's the same! The "C" atom from the "CH2" group of the "CH2CH3" isn't chiral. So you rotate it anyway it won't matter at all.
I want to know how u made the video
Very nice
I have seen a first RUclipsr whose thumbnail only gives the answer of whole topic "enantiomers" non super imposable mirror image
Thanks 🥺
As a visual learner, why didn't i take to RUclips videos sooner?!! 😅
you da GOAT
Thankyou
What is the meaning of the line, line
Can anyone please clarify whether the Carbon from the methyl group at 03:32 is also a chiral carbon or not. Thanks in advance and great video!!
It’s not because for a tetrahedral carbon to be a chiral center it has to have 4 different substituents. The carbon in the methyl group is bonded to 3 hydrogen atoms, which are not different, therefore it is not chiral
It is not because 3 Hydrogen attached to the same Carbon atom.
Thank u
I had one question, how high are the chances that what you taught isn't wrong. Which sources do you refer ?
I'd give you some homemade dumplings if i could. thank
at 6:33 wont the chlorine be at the left side instead of the right side and the bromine be at the right side because you are
changing the sides.
Yeah this video had many mistakes
Sure if you’re drawing it as if a mirror was there. But then flip that over and you get exactly what he drew. Enantiomers have all stereocentres with the opposite configuration which he drew, so it’s valid.
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ako raman siguro diri ang wa japon kasabot animal
Didn’t understand a thing
Skill issue
U r good very good i wish I could see u r face
i dont know about thus compound....
I don't like how he says enantiomer,,,
Then skip the video
i don t like how you explain, you miss lots of details ]
ممكن اروح الحمام يا مستر
Learn to pronounce enantiomer correctly
Ahh trying to prove that you smarter than him by correcting him
Many people spell the same