Nucleophilic substitution reactions with ammonia
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- Опубликовано: 9 май 2015
- Mechanisms! You have to love them, they will get you loads of marks. This video will show you how to draw the mechanism for the reaction between ammonia and a haloalkane to make an amine including the reasons why ammonia has to be in excess!
8 yrs later so helpful still! Thank you!
You're welcome!
Thank you, this was very helpful. I have my assessment today and I'm certain I'll get full marks on the NH3 questions. Much love.
Really great video, has helped me understand this concept better :) Thank you
+Bambi InTheGraveyard Brilliant! Good luck with your studies! (I like your profile name - different!)
Very clearly spoken thankyou!
thankyou so much! I finally get it
+Chloe Walker Brilliant! Please share the vid. The more people it helps, the better!
Thank you your video really helped me understand this mechanism!
This really did help!
You're so welcome!
you are just the best!
nice and very much understanding
Dankie grootman 💯🔥
Thanks a looot!!
bro saving my life fr
so helpful
Thank you so much sir
amazing thank you
thank u good vid
thank you!!!!!!
Thanks ! :D
You're welcome!
Hi, thanks got this video it really helped :) Just wondering, what would happen if there isn't excess ammonia present (like just a bit of ammonia)?
+Hasan Raza Thanks very much! You would get a lot less product.
I LOVE YOUUUU
Hi is this SN1 or SN2? I've assumed it is SN2 because it is a Primary Haloalkane so why isn't a transition phase shown? Or is it shown by the fact there is no carbocation ion so therefore it indicated that it has already/immediately reacted to give the product with nh3+
same
you legend
What about SN1 AND SN2
is the ethanilic condition necessary?
please could you increase the board in the future....... that's if you see this
Love from Nigeria... >-
Why is the carbon said to be electron deficient is it in comparison to Bromine and also why does the nucleophile want to bond to the carbon I didn’t quite get it this video really helps though.
It might be because in a C-Br bond, due to the difference in electronegativity:
The Br slightly attracts the shared pair of electrons from the C-Br bond. As a result, the area around the Br atom is slightly more negative (due to presence of electrons (-ve charge)) in relation to the Carbon and likewise, the Carbon is slighly more positive.
Because the Carbon is slightly more positive compared to Bromine, it is prone to attack by a nucleophile.
The nucleophile is attracted to the relatively +ve charge of the Carbon.
Because the Bromine slightly pulls in the shared pair of electrons from the C-Br bond, the Carbon is electron deficient as the shared pair of electrons is not as close to it compared to the Bromine.
When you say the second ammonia is acting as a base/proton acceptor, is that why it bonds to the hydrogen, because it wants the hydrogen atom's proton?
Yes
Unfortunately no. The naturally occurring hydrogen atom that we find on the periodic table is only made of a proton or an electron. But in this reaction, the bond between the nitrogen and hydrogen undergoes heterolytic fission, which means that the nitrogen ion gains both electrons in the bond and returns to normal. However now that the hydrogen has lost its electron, it is now a proton. Because the ammonia is is bonding to the hydrogen (dative covalent bond) it is a base as it is a proton acceptor. The ammonia is providing both electrons in the bond, hence it becomes an ion (ammonium+)
my g
i thought the arrow has to touch the bond isn't it? the C-Br bond
+ikhigdadf Hi. No it doesn't have to touch the bond but it must be clear that the arrow comes from the bond. That's what matters.