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Topic: Correct Assignment?  (Read 4169 times)

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Offline Messi

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Correct Assignment?
« on: November 22, 2012, 10:08:08 PM »
Hi guys,

I have an NMR spectra of my product. It looks pretty clean to my eyes.

I was wondering if you guys thought my assignment was correct! Thanks! :)
« Last Edit: November 22, 2012, 10:56:37 PM by Messi »
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Offline discodermolide

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Re: Correct Assignment?
« Reply #1 on: November 22, 2012, 10:36:39 PM »
It would seem to be ok.
By the way could you post the file, I'd rather not download it.
Press additional options and you can upload it.
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Offline Messi

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Re: Correct Assignment?
« Reply #2 on: November 22, 2012, 10:58:24 PM »
There we go. But don't you find it weird that my protons HD and HD[sup'[/sup] have significantly different chemical shifts while the same doesn't hold true for protons HB?
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Offline discodermolide

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Re: Correct Assignment?
« Reply #3 on: November 22, 2012, 11:07:44 PM »
Influence of the thio carbonyl?
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Offline Messi

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Re: Correct Assignment?
« Reply #4 on: November 22, 2012, 11:11:40 PM »
Quote from: discodermolide on November 22, 2012, 11:07:44 PM
Influence of the thio carbonyl?

Yes maybe!

But do the rest of my assignments look logical? Is the THF assignment logical?!
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Offline discodermolide

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Re: Correct Assignment?
« Reply #5 on: November 22, 2012, 11:37:24 PM »
As I said it looks ok. The THF signals are fine.
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Offline fledarmus

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Re: Correct Assignment?
« Reply #6 on: November 23, 2012, 09:47:19 AM »
It is quite possible that the differences you see are not between HD and HD', but between the HDequatorial and HDaxial. Six-membered rings frequently show fairly large differences between axial and equatorial protons.
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Offline Messi

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Re: Correct Assignment?
« Reply #7 on: November 23, 2012, 11:15:45 AM »
Excellent, thank you kindly guys!
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