Electrophilic Aromatic Substitution
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- เผยแพร่เมื่อ 15 ก.ย. 2024
- Electrophilic Aromatic Substitution is one thing that benzene does. The mechanisms are getting trickier, no? Don't worry, practice makes perfect. From halogenation to Friedel-Crafts alkylation, this is a handy family of reactions.
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Which university
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How'd the rest of your class go?
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If I might ask, did you indeed make an A?
@PunmasterSTP lol I actually couldn't remember, and I went to digging for my transcript on my computer. I ended up with a B though.
@@seasq Oh sorry, I didn't mean to make you go digging for your transcript! Either way, I think it's still cool that you ended up with a B 👍
@PunmasterSTP lol no worries. It wasn't too hard to find since I recently went back to school for another degree. I'm happy I got that B too. It was an interesting but tough class.
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How'd the rest of your classes go?
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Can you do a video on Nucleophilic Addition to the Carbonyl group and Nucleophilic Addiction-Elimination at the Acyl Carbon?
+Karina Lopez i will add it to the list!
Thanks!
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Sir please explain generation of electrophile in nitrosyl chloride
Why cl- forms while N is more electronegative
Hello, Professor dave, great video! When the Br2 adds to the Ferric bromide, having the benzene attack the electrophilic bromine instead of the terminal would still be correct, right? We'd generate a bromide ion because the electrons would go to the nucleophilic bromine and the electrons donated to the ferric bromide would be given back to the electrophilic bromine.
Professor please make video on GOC GENERAL ORGANIC CHEMISTRY {Main topics for jee }
Great!
Thank you!
wow, i'm surprised that I got it. The explanations in the book just confused me even more. thank you.
Professor if you're reading this comment then I urge you to add some more reactions to your organic chemistry playlist. Reactions of Degree level, that is. This stuff is high school level, very useful still we gonna need those additional reactions please! ;)
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It would be great if you even added a video on Nucleophilic Aromatic Substitution...
I will try to include that in the next round of updates!
Sir do a video on nitration of benzene and there resonance structure
Thanks prof.
So so helpful, thank you!!
Why can't Ochem teachers be clear like this... like are all ochem teacher all over the place?
Thank you very much. I love the way you explain.
But I have a question, Why would FeBr3 and Br2 interact in the first place to begin with? Because by doing that they are creating unfavorable formal charges. Metals dont like to be negative and Nonmetals don't like to be positive. Fe is accepting e- and becoming negative and then its not liking it. Why would I put something in my mouth knowing I would not like it and then throw up? Lewis acid concept sounds like BS in this scenario.
It's a good question! But remember that reactions don't have to be especially favorable to occur. That is to say that endothermic reactions will proceed, as long as a collision occurs with sufficient kinetic energy to overcome the activation barrier for that reaction. As for the analogy with the food, it doesn't hold, because you are sentient and molecules are not.
and also the Br-Br bond is considerably weak, given the relatively large size of the atoms and the fragile, distant bond radius
Good
In nitration of benzene why does an electrophile attaches to the meta position rather than Ortho and para
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professor please do a tutorial about molecular orbital treatment of benzene . please
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Do you know what can break a Benzoapyrene Aromatic ring?
what about the middle resonance structure , how does it form the product
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please can you explain cine and ipso substitution?
hey......sir felt great doing organic on my own all thanks to u. Can u explain why WOLF KISHNER REDUCTION more preferred over CLEMMENSON REDUCTION for ketones?
+Bhavya Yadav wolf kishner is under basic conditions using hydrazine, clemmenson is acidic conditions, so if the substrate is base-labile you want clemmenson, if it's acid labile you want wolf kishner, depends on the substrate in question.
Also, another doubt.. If the formation of the co-ordinate bond between bromine and FeBr3 creates a formal charge that is energitically unstable. Then how come it does even happen??
endothermic reactions happen all the time, it's just a matter of a collision occurring with sufficient kinetic energy so as to surpass the activation energy for the reaction.
thanks proffessor iwant to inquire about how the positive charge on the bromine dis appears
it's neutralized when it gets the electrons from the Br-Br bond
What if we are presented with the reaction:
Ar-E + H-A --> ?
What is the product?
Hmm, I suppose it depends on the acid and the electrophile. Some acids might be strong enough to add to benzene, I suppose. But the group on the ring might react with the acid too, especially if it is a hydroxyl, amine, or carbonyl.
get that organic chapstick big boy. other than that thanks for helping me big boy
now i am cleared....at 3:40 thts the only doubt i had
sir do you explain me adsorption complex???
Does professor Dave still answer his email?
Hey at about 7:45 ..
You said benzene reacts with the bromine atom to the left as the bromine atom on the left gives electrons to the Br+ on the right. So wouldn't this bromine atom( the left one) become Br+ ?? coz one electron of the left bromine also goes to the right one?
So in this reaction does Br+ react with benzene???!!
and if it does.. how come bromonium ions react? And isn't it actually energitically unfavourable to rip apart an electron from Bromine (or chlorine) to convert it into Bromonium(or Chloronium) ion??
This is confusing me..
Pls explain in detail
Thanks!
a pi bond from benzene coordinates to the bromine atom so it remains neutral!
sry I didnt know how to comment correctly.....
nice video :) but I didnt get where the H-proton in step 3 was coming from ?
there's only two steps! you mean the second step, elimination? that proton is on the substrate, remember that in benzene every carbon has one hydrogen.
Are there any describtion of A? (Like E is Electrophilic)
1:39 it doesnt matter
he probably chose A for acid(Lewis)
Hey Dave, can AlBr3, BBr3 also work as catalysts if they are lewis acids?
hmm yes i believe i've seen AlBr3 being used, i think BF3 as well, i think those are pretty common!
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What is this positive charge for in Arenium ion? I'm not getting this
if the pi bond acts as a nucleophile then one of the carbons in benzene loses an electron domain
Ohk.. carbon loses an electron domain so that bromine can be attached to the carbon right?
Yep!
@@ProfessorDaveExplains thanks alot
Testing
Pi bonds interact w electrophile
Comparable to sn2
First step til the ion is formed is the same as addition. Addition is reverse of sn2
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why does Benzene Give electrophilic Substitution if its Unsaturated 😏
doesn't have to do with saturation! it's because it's aromatic, so it tends to do reactions that allow for retention of aromaticity.
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