Proton NMR practice 1 | Spectroscopy | Organic chemistry | Khan Academy
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- Опубліковано 29 лип 2014
- Practice determining the structure of a molecule from the molecular formula, hydrogen deficiency index, and proton NMR spectrum. Uses example of ethylbenzene. Created by Jay.
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Organic Chemistry on Khan Academy: Carbon can form covalent bonds with itself and other elements to create a mind-boggling array of structures. In organic chemistry, we will learn about the reactions chemists use to synthesize crazy carbon based structures, as well as the analytical methods to characterize them. We will also think about how those reactions are occurring on a molecular level with reaction mechanisms. Simply put, organic chemistry is like building with molecular Legos. Let's make some beautiful organic molecules!
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When the 12 minute Khan video make makes a 2 hour lecture finally click ✌🏼🎉
What if you don't know the chemical formula? What if all you have is the Spectra data and some random info (i.e., you know that the unknown compound is insoluble in water, aq. HCl, aq. NaHCO3, and aq. NaOH and it's exact mass is 148.1 g/mol)
The 'Carbon next door' sounds like a horrible chemistry romance xD fantastic video though, really helpful!! Please keep doing these!!
I had the opportunity to use my knowledge of pNMR decades after learning when a Philadelphia-based Pharmaceutical Company had us characterize their API. It had an aromatic ring and an NMR profile that I reviewed in my capacity as GMP QA Specialist prior to releasing our CoA and data package to the Pharma Co. We had outsourced the NMR work to a subcontracting lab. They reported that NMR data was consistent with the structure of the API. Our Project Manager approved this before handing the package over to me. I clearly determined that the proposed structure was NOT supported by NMR. The ring substitutions were misplaced. I informed Management, they informed the Pharma Co. and they revised the structure of their drug. My request that we inform the subcontracting lab of their error fell on deaf ears.
Can you turn the audio up in future videos please. I hardly watch Khan Academy videos because despite having my device's audio all the way up, the video is still hardly audible. I enjoy the videos though.
why did you multiply it by 2 ?
Hdi=4 but benzene ring only fulfills hdi=3 ... Why another double bond didn't come?
Videos are always good but I don't understand why the volume is always so low on all the videos.
I found your step-by-step way of approaching these problems to be extremely helpful in explaining the methodology required in interpreting H-NMR data. In particular, the visual circling of protons on the chemical structures helps to reinforce your explanation regarding what each peak on the spectra shows us as we try to interpret. In explaining even the most minute details of your thought process, this video would serve as an excellent resource to students who feel as though they are behind, as well as advanced students who are simply seeking reinforcement. Excellent work.
Thank you for making a 3 hour lecture that my professor gave us into a much more understandable
some people on khan academy deserve a medal! Jay is definitely one of them <3
THANK YOU!!! Now, I finally understand how NMR analysis works!
My textbook rushed through this topic, especially the HDI. Didn’t show us how to calculate it but now I know :) very helpful
these videos really helped in understanding NMR... thanks for uploading such educational videos.. keep up the good work !
so very helpful. I cant believe how fast I got this after being tortured by this for several lectures, understanding nothing. Thank you so, so much.
I am overwhelmed. I have an exam to write in about five hours and this video is a great one. Straight to the point. Perfect!!!
Awesome understanding. By keeping the Silverstein book and this video anyone can interpret the 1H-NMR spectrum. Thank you for the best video.
The video that finally clears up all the confusion! Thanks so much.
After almost a whole term in grade 10 not understanding a thing about NMR spectroscopyI finally understand it after watching this 12 minute video. I finally get the relationship between molecules and their NMR spectrum. Thank you so much!!!
You explained this exceptionally well. Thanks!