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Correct Assignment?
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Topic: Correct Assignment? (Read 4167 times)
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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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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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Messi
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Posts: 252
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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 H
D
and H
D[sup'[/sup]
have significantly different chemical shifts while the same doesn't hold true for protons H
B
?
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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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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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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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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 H
D
and H
D'
, but between the H
Dequatorial
and H
Daxial
. Six-membered rings frequently show fairly large differences between axial and equatorial protons.
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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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Correct Assignment?