NMR Made Easy! Part 5 - Finding Complex Splitting - Organic Chemistry
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- เผยแพร่เมื่อ 20 ธ.ค. 2024
- 5th Video in my NMR Series. I go over how you can identify or find that annoying thing we all have to learn, called Complex Splitting.
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●NMR 1/6 Electronegativity and Shielding(NMRs) • NMR Made Easy! Part 1 ...
●NMR 2/6 Equivalent Hydrogens- • NMR Made Easy! Part 2A...
●NMR 2.5/6 Equivalent Hs Part II • NMR Made Easy! Part 2B...
●NMR 3/6 What NMRs Tell Us- • NMR Made Easy! Part 3 ...
●NMR 4/6 Molecules to NMR- • NMR Made Easy! Part 4 ...
●NMR 5/6 Complex Splitting- • NMR Made Easy! Part 5 ...
●NMR 6A/6 NMR to Molecules- • NMR Made Easy! Part 6A...
●NMR 6B/6 NMR to Molecules- • NMR Made Easy! Part 6B...
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I asked my Prof how to do this/explain the complex splitting of H's five times and each time he made me more and more confused. This video explained it thoroughly and simply. Thank you!
Just watched this 10 years later and he explained something I haven't been able to grasp in a week in 5 minutes.
🧩!
2:11 I never understood that until I built a model and looked at it from the top and saw how the molecule was symmetrical. If anyone is still having issues understanding these environments, please build a model just as you see it drawn and stand it up on a table. Place the model so that one end is toward you and the other end is away from you, look down at it, and you'll see the symmetry.
I have taken my lower division O chem and now im taking upper div Ochem and you just explained complex splitting way better then either of my professors or TA's ever could!
💪🏼 2012 Frank would be so proud to know this 😊. Here’s a more updated practice problem if you wanna test yourself! 😉 th-cam.com/video/_75WHlDvbXM/w-d-xo.html
Where are you taking OChem at?
currently taking organic chem 2, i cant find your previous videos, this one made alot more sense than in class
Thanks for the feedback, I really appreciate it! Thanks for pointing the complex splitting with pi bonds, I completely forgot about it .. woops =X. Maybe I'll make another video to cover that. This video series might end up being 7 Videos actually haha. If you are still having trouble going from a NMR graph to a molecule(the part 6/6/ that I haven't made it) just give me a heads up and I'll try to do one soon. I'd really appreciate it if you could share my channel with your friends thanks! =]
thank you, this helped quite a bit. I was so lost on complex splitting before this video
god bless you ,.... you saved my test dude that was short and easy to grasp ,
helped alot......lifesaver need of the hour
Bruh thank you so much I was so fuckn lost in the sauce with the nomenclature of this. Why not just say C split by a doublet and triplet. I get it it's long but man my professor did a horrid job explaining this. What a goat.
Haha you’re welcome! I would recommend this other vid I made with my buddy - Dr Jason Dinsmore / TheOchemWhisperer! th-cam.com/video/_75WHlDvbXM/w-d-xo.htmlsi=78GDdLFcAGStVQuF
I just watched all the videos and I want to thank you for making them. This last video was especially helpful because I was having trouble with complex splitting but this made it very clear. Cheers!
great video, very helpful
Saying "1 bond 2 bonds 3 bonds" over and over again must make your mouth hurt!! But great job on these videos, NMR finally makes sense to me. thanks, and keep being awesome!
I have to subscribe now. You helped me so much for my Orgo 1 final and now Orgo seems so much simpler. My textbook over complicates this whole spectroscopy chapter. Thanks so much! :)
+Kyle Smith No prob Kyle!! Thanks for subscribing! :D You should def. check out this vid. and find out about some other awesome resources for Orgo and learn the perks for being a subscriber of my channel! :] th-cam.com/video/1QkGxQCI1es/w-d-xo.html
Yo, my mind has been blown. Watched Khan Academy and didn't get it, came here and I'm like I GET IT NOW. You the man
absolutely stellar video sir
Haha knowledge doesn't mean anything if it's not being shared out and passed on to people AND you did that incredibly well!!! ^______^ (cause I seriously learned almost zero from my lecturers hahaha) Thanks for replying the comment! It really made my day and I just liked your page! I'll be sure to seek for your help should I have any doubts on orgo! Have a great day, Frank! :)
i slept during the whole lecture in my class. glad that i found your videos. you clearly explain everything! thank you (btw i'm sitting for my final exam tomorrow for organic chem)
Your explanations are outstanding! Big shout out from SLU
Thanks for this. NMR is tedious and long winded but I think I finally understand complex splitting.
@4:33 can you elaborate more on why Hc is the "lower" one? Thank you.
No problem! =] I remember when I first learned NMRs and how confusing they were so I just wanted to give you guys a lil help to speed the learning process lol
Thank you so much. I am teaching myself this and without your help it made absolutely no sense. I finally am less scared of these questions.
Hooray for less fear! :] No problemo, keep up the hard work and I'm sure it'll pay off Penny!
Jessica! Hi haha. Your welcome :]. Thank you for letting me know that their useful actually, it's always more encouraging when I hear back from people like you, so once again thanks ;). haha unfortunately I'm sure your lecturers would destroy me in a knowledge contest though :X. And of course you can ask me questions! Just post them on my Facebook page so this way if anyone else has similar questions they can benefit as well. Thanks for the support!!
Hi Frank! I was revising for NMR and stumble upon your videos and before I knew it I watched all 6 parts! ^___^ I'm so looking forward to watch your other videos as I am actually studying the same thing (mechanisms and all @.@) and my notes put me to sleep. SO THANK YOU FOR MAKING THESE VIDEOS! For one thing they keep me awake and at the same time, I learned a lot! You teach way better than my lecturers. Haha. Can I ask you if I have any questions about topics though? :) Anyways keep it up!!
Thank you Frank Wong! You've brought your ancestors great honor!
Finally, a coherent explanation! Would it be incorrect to say the number of peaks of any hydrogen B in complex splitting is simply (n+1) of group A times (n+1) of group C? I do understand the need to further describe the peak shape, but just as a rough check?
You should become an orgo professor :D
Thank you verrryyyyyy much!
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okay can any one explain for 4:53, why cant we call it triplet of doublet?
BTW your videos are literal life saver!!!
So you absolutely can call it a Triplet of Doublets as well. I would check with your Prof for the answer to that Q 😆. Glad the videos are still helpful haha I’m always wondering if they’re holding up after all these years lol. Speaking of which I made a super fun one with Supportive Soccer ⚽️ Dad for complex splitting if you want my more updated take on the topic: NMR H Signals!? Complex Splitting Made Easy! (Pt 1) - Orgo Made Easy - Organic Chemistry
th-cam.com/video/_75WHlDvbXM/w-d-xo.html
@@OrgoMadeEasy thank you so much for replying and I will definitely check out the video!!
And once again your videos are very helpful!! :)
This really helped me with my coursework on organometallic complexes. Thank you very much!
Thanks for all these videos! Really helpful!!
I'm a bit confused on how you knew which hydrogen to do first (knowing its doublet of a triplet instead of triplet of a doublet)
he said to do the lower/smaller first. duplet is smaller than triplet.
It depends on the coupling constant, J. You start with the greater J. Standard values of J are out there
Great video! Although it’s not clear why Hydrogens D are necessarily dt and not td. I take it that the J constant for H’c is greater which is why it comes first making it a doublet of triplets..
thank you so much for this video :)
i'm just confused on peaks of Hb ! as you said we will have two dq for each two Hb :/ should not be just have one (dq) for all Hb ? ? they are not equivalent ?
Thank you soo much Frank, I think I finally understand NMR now!! :DD I'm binge watching all your videos XDD THEY ARE THE DEFINITION OF AMAZING! :D You Sir are Great! :DD
Thank you for uploading these videos! Great way to review for sure
Thanks for watching/feedback!! (Big Shout Back from NYC/Boston) haha. Now if only my cooking skills were outstanding too.
Hey! I'm sorry for not responding sooner, I didn't get any email notifications about your comment like I usually do. (Grrrr *Shakes fist* TH-cam!!) But anyway when I said lower I mean't the splitting pattern was lower since it's a doublet rather than a triplet. So we get a doublet of triplets rather than triplet of doublets. Although you might want to check with you Prof. which order you guys should have it. If he answers, can you tell me what he says as well?
thank you so much for the video! this video is really helpful!
Great explanation... how do cis/trans affect splitting (if at all)?
Thanks! Alkenes themselves very often will cause complex splitting but it depends on each situation. If you get stuck just try to think of each hydrogens environment and if they are being split by 1 group of equivalent hydrogens (simple splitting) or multiple groups of equivalent hydrogens (complex splitting)
Quick question: I'm confused as to the effect of the axis of symmetry. Why do the 6 Ha's produce one triplet, not two?
Likewise, do the doublet of quartets produce one or two sets of dq peaks?
Does the symmetry mean that the equivalent types of Hs, even though they are separated by, say, 6 bonds (for Ha) are combined into one peak?
Cheers! Again, great video.
The 6 Ha's produce one triplet because they are all in the same enviornment technically and are just hydrogens that are being split by two other hydrogens (Hb). Giving you your triplet. The same applies to the doublet of quartet peak, it is simply 4 hydrogens in identical environments that are being split by two unequivalent groups of hydrogens within 3 bonds distance (1 group having 1 hydrogen, and the other group having 3 hydrgoens). And the answer to your last question is yes. The symmetry just helps us see that technically all the Ha hydrogens are equivalent and in the same environment. :]
Hi I just wanted to verify we only get ONE SIGNAL per Chemical environment right? So for example there are 4 Hb's and 6 Ha's in the video right? So just considering only those two I would see just ONE Doublet of Quartet signal and just ONE triplet correct?
Wow you sure know how to inspire me haha, thank you very much for the feedback. I'm glad I could help make Orgo a little more enjoyable ;)
Thanks for the help; this really pieced together my spectroscopy lectures!
Hey, how would you put a doublet of doublets into your AWESOME TABLE? Would it be just the shift and then however many hydrogens and then 2 neighbors or do you do it a special way?
is there any ways to predict the structure of the compound based on the peaks which are complex multiplets in hnmr spectrum?
About the complex splitting .. we just do n +1 rule for each side H and thats it? No multiplying?
Like u did in the video ..it was doublet for the left H and triplet for the other H so the end result is 5 peaks right? So i do that for all compex splitting right?
And thank you so much .
Not sure if youll see this but how come when looking at Hc, you got TQ. I thought if you were looking at equal points like Hb is you would just consider one and then Hc would be TT. Great video otherwise
Good Q! So it’s because there are 4 Hbs all within 3 bonds distance to Hc. So you’d still do 4+1 and get quintet. And 2 Hds so 2+1 = t. And thus TQ or QT 🙂
Looking for an extra practice problem that’s even harder? 😊 Here’s what 2019 Frank made for y’all : th-cam.com/video/_75WHlDvbXM/w-d-xo.html
HII . i have a question>> if in this structure we omitte the oxygen next to carbonyl then what will be the splitting pattern for those nine hydrogen
SO to check, you split by each H environment next to the selected one?
Awesome! I'm glad I could help haha. Thanks for the feedback! I actually went through Orgo I and II without ever learning Complex Splitting so I wanted to help everyone else so they wouldn't have to go through what I did haha. Please help me spread the word of my channel to other Orgo students if you can! Thanks! =]
Ah darn haha, you caught me :X. Good thing the 4+month ago version of me corrected myself phew :D
Frank, thank you so much for such a detailed explanation, yet I wanna ask why in some cases septet of doublets are present instead of doublet of septets if we always start with lower number of hydrogen first? Like the one CH(CH3)2OH
and triplet of doublets are different from doublet of triplets arent they? How can I classify two in a molecule?
Great video, thanks! Would be helpful to see the peaks on a spectrum, considering the effects on chemical shifts due to the oxygens.
Yooo you really helped simplify this thanks!
Frank, thank you so much! you make it so simple... :)
Your welcome! That's how things should be, nice and simple haha :]
Very well done, helped out a lot studying! However, I noticed you don't mention long range coupling through pi bonds which would have been an added help especially in some harder examples. But again, thanks for the help! :)
Thanks, but you don't have j constant. how do you distinguish between dt or td ?
@@aseman8167 that’s a good Q! At BU we never went into depth so we were just told it could be either 😂 🤷🏻♂️
bro i got a midterm tmrw you saved my life
Well that clarifies a whole lot more!!!! Thank you!
Lol I did? Where? Thanks for the kind works =] I'm glad these videos helped! NMRs were my worst fear when I took Orgo I =X.
YASSS THIS HELPED SO MUCH THANX YOU ROCK
why would Hc show triplets quintet? since the 4 Hb's are equivalent, wouldn't it just be triplets-triplets? So like 6 peaks in total?
Yup so if you were Hc you would be neighbors with a family of 2 on one side and a family of 4 on the other side. Hence [2+1=3 (triplet)] of [4+1=5 (quintet)].
You can check out this video for a similar practice problem: th-cam.com/video/_75WHlDvbXM/w-d-xo.html
Thanks ! found your stuff truly helpful!!
Oh and if you have friends/classmates who just aren't getting NMRs make sure you tell them about my Channel as well :].
Thank You. The video was very helpful!
Amazing video, thanks so much!
Thanksssssssssssssssssssssssssssss you saved me from this proton nmr
this was really helpful
Be sure to check out this video as well for extra practice! It’s a harder example with complex splitting 😀
th-cam.com/video/_75WHlDvbXM/w-d-xo.html
*Whew* glad I am still able to do that even though I'm not a Pre-med anymore ;) haha. Thanks for the motivating comment!
Hi should Hb not be doublet of septet as Ha is one environment if not why?
Hi Partha, okay so it would be quartets because EACH Hb group of hydrogens only have the 3 hydrogen A neighbors to the left and 1 hydrogen C. So (1+1 = doublet, 3+1 quartet) doublet of quartets or quartet of doublets. Because the molecule is somewhat symmetrical we are grouping the 6 Hydrogens as Hb. If there were 6 hydrogen As on the top and on the bottom then it would be a doublet of septets. :] Hope that helps a little.
Thank you! Your videos are legit :)
Thanks for the help.
this helped a lot, thanks
Maybe we should think about diasteriotopic proton. Not all geminal protons are splitting the same, HDs will show different singles
Does your back hurt from carrying my whole chemistry for biologists module?
I WAS WONDERING how I got a herniated disc!! 🤔
You should put your social media links in your bio!
AMAZING!
Thank you! I’d definitely recommend checking out this sequel to this video (for an even trickier example!) th-cam.com/video/_75WHlDvbXM/w-d-xo.html
@@OrgoMadeEasy Will definitely check it out. I'm doing 4th year chemistry and still struggle with NMR sometimes XD
Finally I got it :D Thank u !
thanks! Comment's like yours inspire me to continue making them haha
thank you so much ,nice explanation, but sound is not good in some videos.
THANK YOU FRANK
For a minute I read " I now take penises" instead of pennies ... LOL I have been watching your videos for too long... Thanks so much you are amazing . Te Amo :)
Haha Miranda, I think you need to get some sleep. Jkjk, thanks for watching! :]
You can contend with the great Salman Khan himself. Thank you for this Frank
Haha such wise words! Thank you and hope you have a great one too! :]
Wow. You. Are. Simply. Amazing. Frank!!!! :)
Thanks Susanna haha, your too kind ;). I really do appreciate the comment, it's very motivating. Wish you the best with your studies!
I think you're confusing Hb and Hc. If you're saying that the Hbs are equivalent and then only taking one of the Ha I.e 3+1 =4 quartet, then surely the Hc should only be split by one Hb ie 2+1 = 3 triplet not 4+1=5 quintet. Otherwise nice video.
nice explain :)
thank you!!!
You're a Beast!
ugh what a K I N G 😍
jeez this is complicated a little for me , hopefully over time i grasp
I literally still dont understand how to find the splitting of the protons.
I made a follow up video with an Orgo tutor friend - give this a try 😊 th-cam.com/video/_75WHlDvbXM/w-d-xo.html
you had me until this video...It started to get really wordy and/or complicated around Hd and He...I don't know why I just could not get through this video and understand it. The first 5 videos were pretty awesome though
Why did the pretty girl stop appearing in the video series?!