OCR A 6.2.1 and 6.2.2 Amines, Amino Acids, Amides and Chirality REVISION
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- Опубликовано: 13 май 2020
- Complete revision for OCR A A Level Chemistry. To buy PowerPoint used in this video please visit my tes shop - www.tes.com/teaching-resource...
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Great video, a nice compact revision. On behalf of all desperate students revising 1 day before the exam; thank you, really appreciate your work!
You are welcome!
reallyyy appreciate these videos!!!!!
Thank you for your help!
hello sir
just wondering would we have to be able to draw the enantiomers for molecules with multiple chiral centers?
Super helpful! Thank you :)
You're welcome!
Thank you sir
Welcome
Hi, I do this course and I believe you may have missed out the isoelectric point of amino acids in this video?
in the ocr textbook its in a purple box, meaning its extra thing that might help your understanding of the topic but it isn't on the spec so you don't need to know it for your exams etc
hi sir, On one slide it says there are two ways to make ALIPHATIC amines. Adding excess nh3 to a haloalkane and reducing a nitrile. On your next slide it says reducing a nitrile is to make an AROMATIC amine? which is correct?
no, on the next slide it said reducing nitRO to make aromatic, and reducing nitrILE to make aliphatic, different things :)
why do we make NH3Cl instead of just HCl? do we need the ammonia to break the N-H bond or can it just break by itself
I assume you mean the NH4CL at 6:36 ?
In the second step of the mechanism the :NH3 acts as a base, so it takes the H from the N-H bond forming NH4+. The electrons left from that N-H bond on the rest of the molecule retract back to the N and you are left with the primary amine. Then the Cl- and NH4+ combine together
it's ETHANOLIC ammonia!!! Key detail you seem to have missed here!!
Other than that great content haha
for the part where you needed excess ammonia and halogenoalkane to form aliphatic amine
@@Big_Impact_Historicsthe mark scheme accepts both, you can say excess ammonia instead of ethanolic ammonia but if u do u must say excess!
Are Zwitterions part of the OCR Spec?
No, not for OCR. 👍
Why is the Nh3 have a positive charge in the mechanism
Because the extra hydrogen has no electrons (basically acts a proton so has a positive charge). It then reacts with the lone pair on the nitrogen and charge must always be conserved.