More Practice With H-NMR Spectra
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- เผยแพร่เมื่อ 31 ก.ค. 2018
- Let's take another look at some H-NMR spectra to get a little more practice. What do we do with protons on an alkene? How do we predict a spectrum from a structure? How do we predict a structure from a spectrum? Practice makes perfect!
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Studying from your videos is literally so much better than my prof and the book. You explain the questions so well and easy!
your videos are ALWAYS very helpful since the good old days of general chemistry :), i have no idea why you dont get hundred of thousands of views on some of your videos like other channels. Keep up the good work man, you are very helpful, thank you !
Mastered it in 2 examples already. Thank you very much Prof. Dave!
Thank you so much!!! You're videos have always explained the subjects clearly. I was lost about counting the neighbors, thank you for doing this step by step!!!
THANK YOU SO MUCH FOR THE SUMMARIZED EXPLANATIONS OF THE PROBLEMS IT MAKES SOO MUCH SENSE!
I have my final lecture exam for Orgo 1 next week so this was sooooo damn helpful. As always thank you Professor Dave!
Thank you very much, Professor Dave. Your videos make my days go a lot better.
you are a real proffessor, i wish you were my lecture, your videos are always an extra aid towards our learning. i am ready to subscribe and join to any of your premium learnings
NMR always seems so much easier when someone else does it lol. Thanks great video.
But when it comes to do it your self ....?????
Truly an inspiration. Thank you so much for offering us free education.
Sir, you just saved me 8 lectures of my prof, that totals upto more than 8 hours. Thank you sir, for I will always be grateful of your teachings.
Thank you so much! I first watched the theory video and then made this exercise and can't believe I just learned it.
Your videos on NMR are very clear, thank you for making them.
Love listening your video intro again and again🔊🎧 . That's stuck in my head . my sister always finds singing your intro song all the time. And now even she is adicted to it ✌. Nice music professor.
this was useful thanks but how about C13 NMR
thanks for the help Prof. Dave super helpful
Your explanation of this was so much easier to understand than my professor's
This was great practice; thank you so much!! (I agree with the others; this haircut suits you very well!)
Also useful: the second to last compound analyzed, Ethyl Acetate, is useful to know the NMR spectra if using as a solvent in a reaction in order to determine if it is a contaminant when NMR spectra is ultimately obtained. You can tell if the peaks correspond to Ethyl Acetate.
Sir you are doing really great .... Go ahead ..Your all videos are fully amazing ..All along i watch your videos and i get benefited ..thanks so much for your hard work sir
Dave you are actually my hero
You taught all ways of basic problems ("basic" = I wasn't solving till now)
Happy for finding u before graduation
Also, I always thought we had to just accept where the functional groups land on the wave number axis, cause my teachers and also videos I've found 'd usually say that we need to just use the "characteristic peak" of each functional group as the prediction, so, we would always need a table next side or just have to decorate the most important ones...
Anyways, u showed me the real logic involved, and in a real simple way.
Thank you
Thank you so much greetings from Germany!
Thank you so much💫
I am just amazed. you are too good
THANX prof .i learnt a lot , i don need to open my slides i'm now ready for exAm
You are wonderful teacher
I have my final exam next week. Thanks to covid we have to relay on TH-cam mostly... Thankfully I will be able to answer in my organic exam after watching this video... quite helpful ☺️
You look like my favorite professor both in college and TH-cam…
Good afternoon Professor Dave! Thank you so much for you videos they help me a lot! However I had a bit of trouble understanding why is the proton C and D closer to the O than the proton A.
I'm doing a course in Analytic Methods of Organic Chemistry, and your videos explain the subjects 3 times faster than my lectures do. Seriously, 15 min instead of 110 min 🤣 and I understand more from your videos than the lecture. Thanks a lot!!!
Grazie mille, sei capace di rendere la NMR molto più facile da capire!
U r still a snack but I can't pretend Jesus is teaching me chemistry anymore
😁😁🤣🤣🤣🤣
Gotta drink some water man, you're thirsty AF😛
Plz more videos on nmr spectroscopy
THANK U SO MUCH
amazing!
Thank you :)
THANK U
Thxs a lot sir😀 best wishes frm mauritius😃
Thankyou very much🙏 btw u look better with ur haircut prof 😍
Hello! I wanted to ask if you could do one more video on the topic. I had to work with a spectrum of Tolbutamide and somehow it showed one more proton than the actual structure has and I don't really find an explanation...
thank you man
very interesting!
Appreciate the video and this haircut is fire!!!!!
Please do one for CNMR
Thanks
U r great sir!!! I am Able to get a lot of knowledge becoz of u thank very much keep it up ....
And why have you cut u hair .....🤗🤗
Aye professor! Thanks
Where was this last semester 😭😭
Thanks, Please is there video for the explanation for last structure you put?
I ust watched the video and asked myself the same question, did you get an answer in these 2 years?
Professor dave rocks
Bell'uomo!
More practice with H-NMR? More like "Magnificent videos, and the information can take you very far!"
Good
couldn't recognize you man thought it's some other dude until I scroll down to the comments.
You should really do a 2-D nmr lesson
Where's the next part of this video? :c
C4O2H8 example: Is it possible that the oxygen and carbonyl could be swapped (oxygen connected to the methyl and the carbonyl connected to CH2)?
that would yield different chemical shifts! but they would be pretty close so it's definitely a tough call. if i remember correctly this is the software generated spectrum for the structure i gave so hopefully i didn't give the wrong one! but i think the 3H singlet would be way more downfield if directly next to an oxygen atom.
Thank you! It's much clearer now! @@ProfessorDaveExplains
Could anyone explain how alkene protons are deshielded? Why are they in the range of about 5-6.5 ppm?
I believe it is because the alkene carbon has more S character. This means that the carbon has pi bonds and in a pi bond, electrons are held more closely to a nucleus than in an SP hybridized bond. Therefore the electron density of the bond is closer to the carbon nucleus and so the hydrogen is de-shielded.
Don't quote me on that though I'm not 100% sure!
In the first example is because of the presence of the COOH group. The Oxygen was pulling the electrons towards itself and so depending on the distance of the Protons from the COOH group, the more up or downfield they are. We can see that proton C (as he labeled) is more downfield because is closer to the COOH group than the proton D. Proton D is not deshielded because it is next to a methyl group, but because there is a COOH group in the molecule.
Sir which software your using in pc, to find that NMR peaks and 3d diagrams
check the description section it's linked
David i do have H-NMR, bu i'm not sure how to interrupt the data. Can i please send the spectrum private to you, but i don't want to be on the internet.
just please help me if the product is made or not. i have a suggested structure
This is ethyl ethanoate. How do we know that it's not methyl propanoate?
What does deshielding mean?
it means withdrawing electron density away from the nucleus of the atom
Thank you for explaining. Plus, you look better with a haircut.
I miss the long hair :( ty for the video, doe!
The hair makeover stopped me for a while. Wasn't ready for that.
Where's your hair and plaid shirt Dave? Did an evil girl get her mits on you?
haha it was time for a change! perhaps i'll grow it back out one day.
@@ProfessorDaveExplains actually you don't need to ,because you look good with short hairs
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You look a bit like Adam Sandler with the short hair lmao. Great vid though, helpful for my exam next week :D
WHER E IS THE HAIR!?!?!?!?!??!
Omg where's ur Jesus hair
chopped it!
grow ur hair back