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Topic: penacethin IR  (Read 5359 times)

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Offline helper

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penacethin IR
« on: November 26, 2013, 02:39:51 PM »
hello,

My question is attached.

thank you ahead.


Mod edit: title changed
« Last Edit: November 27, 2013, 02:49:35 AM by Dan »

Offline discodermolide

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Re: penacethin nmr
« Reply #1 on: November 26, 2013, 02:44:47 PM »
This would look like an infra-red spectrum, not an NMR.
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Offline Borek

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Re: penacethin nmr
« Reply #2 on: November 26, 2013, 03:12:18 PM »
I don't want to be picky, but it is not the only problem with the picture.
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Re: penacethin nmr
« Reply #3 on: November 26, 2013, 04:15:28 PM »
yes ypu are right its IR speta. Before publishing this spectra a I looked at NMR spectra of the molecule.
but what is the other problem of the picture?


Offline discodermolide

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Re: penacethin nmr
« Reply #4 on: November 26, 2013, 08:15:41 PM »
Perhaps you should re-think the peak assignment.
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Offline huutrong

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Re: penacethin IR
« Reply #5 on: November 27, 2013, 03:09:45 AM »
I think your spectrum is right. Amide is usually have a strong signal than amine. And normally the -OH is more broader than -NH. I saw these sentences in my teacher's lecture:
"The amide functional group combines the features of amines and ketones because
it has both the N-H bond and the C=O bond. Therefore amides show a very strong, somewhat broad band at the left end of the spectrum".
And the C=O in amide normally at 1640-1680 cm-1.

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Re: penacethin IR
« Reply #6 on: November 27, 2013, 02:11:29 PM »
thank you very much, it is  very helpful!
 have a nice evening!

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