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Author: Subject: Second-order NMR splitting
Metacelsus
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[*] posted on 9-12-2016 at 08:27
Second-order NMR splitting


Can anyone identify this pattern? It showed up in the spectrum of a side product of one of my reactions, and I haven't seen anything like it before. (The spectrum was taken in CDCl3 at 400 MHz).


Edit: These peaks are almost certainly from 2 different compounds.

strange splitting.png - 35kB

[Edited on 12-10-2016 by Metacelsus]




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Eddygp
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[*] posted on 9-12-2016 at 09:36


I was expecting a doublet of a doublet... but this.. Wow!!
H MNR I guess, yes?

Is there any F, P or some other NMR active element in your sample? (apart from H, but that can couple to H)




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Metacelsus
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[*] posted on 9-12-2016 at 13:06


No, it's just H, C, O, and S. I'm starting to think that it might just be two unrelated pairs of doublets from an impure sample.



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[*] posted on 9-12-2016 at 14:58


Sure looks that way
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Metacelsus
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[*] posted on 9-12-2016 at 17:26


Yes, it's definitely at least 2 compounds. Originally, it was 1 peak on the MPLC, but I changed to a better eluent, and it came off as 2.



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[*] posted on 10-12-2016 at 00:21


Glad to hear you resolved the issue.
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