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Topic: Broad singlet in 13C NMR ???  (Read 4333 times)

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Offline el quimo

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Broad singlet in 13C NMR ???
« on: December 15, 2015, 04:13:49 PM »
 I get a broad singlet at 47.3 ppm in a 13C spectrum.  A HMQC revealed it correlated with a broad peak at 3.5 ppm.  Has anyone seen something like this before?

I am attaching COSY and HMQC.  Thanks.
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Offline ATMyller

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Re: Broad singlet in 13C NMR ???
« Reply #1 on: December 16, 2015, 07:54:50 AM »
What solvent are you using?

A CH2 next to amine group or solvent impurity perhaps.
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Chemists do it periodically on table.

Offline Irlanur

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Re: Broad singlet in 13C NMR ???
« Reply #2 on: December 16, 2015, 08:44:07 AM »
So what exactly is the question? it is just some sort of exchange phenomenon.
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Offline el quimo

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Re: Broad singlet in 13C NMR ???
« Reply #3 on: December 16, 2015, 12:06:04 PM »
I figured it out.  It's two CH2s that have hindered rotation due to some nearby tertiary amines.
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