Just letting you know that you're still helping students, 8 years later. Your website is what is helping me feel prepared for my ochem final when I didn't know where to start.
You’re so awesome, and the best out there, Leah and I could only wish I could be as great as you in understanding ochem with this level of understanding. I honestly love checking out the resources you put out there for us which helped/helps me more than you know so I at least wanted to let you know that! I also appreciate how clear, concise and colorful your explanations are and love your enthusiasm which I can tell from your voice that you’re truly passionate about these topics and what you do..Thank you!!! :)
positive charges are not transferred. However, when a positive atom pulls electrons away from another atom that other atom is now slightly less negative. see my video on polar bonds which explains this concept in more detail.
One thing thing you should explain is how the mercury is able to form a bond with the acetate while still having an inert lone pair. Confused me for days and have just been told that the bond between it and the acetate is actually between the 5d10 electron orbitals and not the 6s2's!
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/
Awesome video, thank you so much! I just have a question at 3:05, when you say that the carbons have a slight positive charge. Why is that? The electronegativity values of carbon (2.5) and mercury (1.9) tell otherwise... Or is it more like mercury "sharing" that positive charge through the bond?
The electrons in the bond with mercury will gravitate towards that positive charge on mercury, leaving a partial positive (not a full positive) charge on the carbons. So if mercury and carbon were both neutral, you would be absolutely right. The electrons would gravitate towards what is more electronegative. But in this case, the mercury is not neutral. It holds a full positive charge. And electrons are attracted to positive charges.
In presence of Mercuric ion nucleophilic reaction occurs whether there is carbon carbon double bond. So why this reaction is known as electrophilic addition
I'm sorry, but I don't offer tutoring through CZcams comments. For help with this and more, I recommend joining the organic chemistry study hall. Full details: leah4sci.com/join
@@Leah4sci omg 5 years later your teachings let me get into a PhD program currently a PhD candidate. Leah, thank you so much for all your hard work we appreciate you so much. Proud to be a woman in stem too.
Most organic reactions are reversible, under the right conditions. 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/
markovnikov rule says that you should add the nucleophile to the carbon attached to the less carborn (more hydrogen) and that's why she add HgoAc to the primary carbon.
If Hg initially holds on to bot a primary and secondary carbon, the secondary carbon will have more partial positive character and THAT is where the incoming nucleophile will attack. In doing so, it breaks the bond between that carbon (secondary) and is no longer attached. However, because it didn't break the bond between Hg and primary, those 2 are still attached specifically BECAUSE it was less stable / less partial positive character
the hyperconjugation from the p orbitals of adjacent carbon atoms has a greater stabilizing effect on a more substituted carbon. basically more neighbors = more substitution = more sharing the electron deficiency
If you're asking why the more substituted carbon has more partial charge, this has to do with carbocation stability, the more substituted the more stable. (I have a video on it here: leah4sci.com/carbocation
If you write the electron configuration of Hg, you'll see that it has valence electrons that are present on the outermost shell of the atom. This lone pair is more than likely being pulled from the 5d subshell.
+Rania Mahfouz Hello, if you look at the mechanism carefully, you will find out that the oxymercuration method involves the of a triangle intermediate. so, the best way would be to add from the opposite side. It is anti.
If you go back to the first step of the mechanism at 1:11, you'll see that one of the acetate groups was kicked out from the original Hg(OAc)2 reagent. That remains in solution, up until it might be needed to remove a proton.
Just letting you know that you're still helping students, 8 years later. Your website is what is helping me feel prepared for my ochem final when I didn't know where to start.
Wow, always happy to help! I hope the final goes well!
You’re so awesome, and the best out there, Leah and I could only wish I could be as great as you in understanding ochem with this level of understanding. I honestly love checking out the resources you put out there for us which helped/helps me more than you know so I at least wanted to let you know that! I also appreciate how clear, concise and colorful your explanations are and love your enthusiasm which I can tell from your voice that you’re truly passionate about these topics and what you do..Thank you!!! :)
awww! thank you so much for the wonderful feedback. You are very much welcome! Always glad to help. All the best! :)
I love you, thank you so much! This video will help me pass Organic Chemistry II :)
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Thank you!!!! You saved my life! I love the way you make things sound sooo easy! Thanks from France!
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God bless your soul.
thank you!
Outstanding! I was struggling to understand my textbook's explanation and example. Your explanation is fantastic.
awwwee! you're welcome! Glad to help!
Excellent & clear explanation. Thank you so much. Please keep up the good work! So much easier to follow than "The organic chem tutor"
Thank you for the nice feedback. You are very much welcome.
Well he is more to find problems and work through those. This is more of telling you exactly the mechanism. THey both work in different ways
Thank you so much! Great explanation, the colors helped so much.
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Thank you so much Leah!
Your explanation is so clear and makes everything much easier to understand! Keep up the good work! :)
Glad the video helped you understand the topic better! You are very much welcome!
I am a student studying in Korea🇰🇷
It was very helpful. thank you!!👏👏
Glad I could help!
thanks a ton...today i understood the exact reason for formation of a non classical carbocation...😘
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very helpful for students! good job Miss Fisch
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everything makes sense now, thank you so much
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I love your voice
When she hit you with that "leah heerree"
Aww thanks
Thanks for the good explanation
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Excellent so clear! Thank you so much!
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hey leah i love you videos so much, they've been helping me to study a lot recently. can you make videos about alkene reactions ? thank you
You're so very welcome! You can find all of my resources matched to the topic you're studying here: leah4sci.com/syllabus
Thanks for creating such a helpful video!! Could you explain where the lone pair on mercury comes from at 2:20? Thanks!
This is part of Mercury’s configuration at this oxidation number. Not required knowledge at the undergrad level so easier to take as fact.
Very helpful congratulations madam 👍👍
So glad to hear it!
We just learned this. It was so confusing until now!
Happy to help clear things up!
Wonderfully explained!
Thanks for your kind words :)
just saved me from going nuts.!! thank you
Whew! Glad I could help!
Thank you very much.
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I love your videos. So much help!! Thank you.
Glad you love them and happy to help!
thanks leah
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Am helped very much ❤❤
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thanku very much....
it was a great explanation...
helped a lot...😊😊
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Thank you so much!!
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at min 2:58, what do you mean that the positive charge on the carbon transferred to Hg, making it positive?
positive charges are not transferred. However, when a positive atom pulls electrons away from another atom that other atom is now slightly less negative. see my video on polar bonds which explains this concept in more detail.
I can’t thank you enough I have subscribed and recommended you to others to subscribe too. Thanks so much
You're so welcome, and thanks for referring others to my channel! That's the highest praise I can get!
One thing thing you should explain is how the mercury is able to form a bond with the acetate while still having an inert lone pair. Confused me for days and have just been told that the bond between it and the acetate is actually between the 5d10 electron orbitals and not the 6s2's!
damn i never knew bond is between the 5d10 orbitals.. not sure how that works but was confused about this as well, thanks
Also, why is there a lone pair when mercury is bonded with 1 acetate and no lone pair when mercury is bonded with 2 acetates?
When we reducing with hydride, what the mechanism that happened? What makes the H placed the HgOAC ?
This mechanism isn't well understood / taught. That's whY i skipped over that bit (as I explained in the video)
What is the product formed when i carry out oxymercuration-demercuration hydration of a benzyl methyl ketone like 1-phenyl-3-butanone?
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/
Awesome video, thank you so much!
I just have a question at 3:05, when you say that the carbons have a slight positive charge. Why is that? The electronegativity values of carbon (2.5) and mercury (1.9) tell otherwise... Or is it more like mercury "sharing" that positive charge through the bond?
The electrons in the bond with mercury will gravitate towards that positive charge on mercury, leaving a partial positive (not a full positive) charge on the carbons. So if mercury and carbon were both neutral, you would be absolutely right. The electrons would gravitate towards what is more electronegative. But in this case, the mercury is not neutral. It holds a full positive charge. And electrons are attracted to positive charges.
@@Leah4sci Ohh, thank you for the explanation. It makes sense now. As always, love your videos!
In presence of Mercuric ion nucleophilic reaction occurs whether there is carbon carbon double bond. So why this reaction is known as electrophilic addition
Pl z mam reply fast
I'm sorry, but I don't offer tutoring through CZcams comments. For help with this and more, I recommend joining the organic chemistry study hall. Full details: leah4sci.com/join
Woman this video is life.
Awesome!
@@Leah4sci omg 5 years later your teachings let me get into a PhD program currently a PhD candidate. Leah, thank you so much for all your hard work we appreciate you so much. Proud to be a woman in stem too.
I had a quick question regarding these alkene reactions...are they all reversible?
Most organic reactions are reversible, under the right conditions.
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/
why did HG go to the primary than secondary if the secondary is the more stable one
markovnikov rule says that you should add the nucleophile to the carbon attached to the less carborn (more hydrogen)
and that's why she add HgoAc to the primary carbon.
***** Thanks for the reply!
If Hg initially holds on to bot a primary and secondary carbon, the secondary carbon will have more partial positive character and THAT is where the incoming nucleophile will attack. In doing so, it breaks the bond between that carbon (secondary) and is no longer attached. However, because it didn't break the bond between Hg and primary, those 2 are still attached specifically BECAUSE it was less stable / less partial positive character
why the more substituted carbon has a bigger partial charge,and attracts the nucleophile.
the hyperconjugation from the p orbitals of adjacent carbon atoms has a greater stabilizing effect on a more substituted carbon. basically more neighbors = more substitution = more sharing the electron deficiency
If you're asking why the more substituted carbon has more partial charge, this has to do with carbocation stability, the more substituted the more stable. (I have a video on it here: leah4sci.com/carbocation
where did the hg lone pair come from? at 2:38
If you write the electron configuration of Hg, you'll see that it has valence electrons that are present on the outermost shell of the atom. This lone pair is more than likely being pulled from the 5d subshell.
in the end product should it be syn - hydration or not ?
( i mean the H in the same side as OH )
+Rania Mahfouz Hello, if you look at the mechanism carefully, you will find out that the oxymercuration method involves the of a triangle intermediate. so, the best way would be to add from the opposite side.
It is anti.
Ok ! ThanQ so much for helping ^^
Oxymercuration is an Anti addition (Hydroboration follows syn addition)
Where does acetate come from at 4:43 ?
If you go back to the first step of the mechanism at 1:11, you'll see that one of the acetate groups was kicked out from the original Hg(OAc)2 reagent. That remains in solution, up until it might be needed to remove a proton.
@@Leah4sci thank you Leah. Great content even all these years later!
your awesome
Thank you :)
super
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