Chemical Forums
Chemistry Forums for Students => Organic Chemistry Forum => Organic Spectroscopy => Topic started by: phth on April 10, 2016, 09:57:37 PM
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Anyone else observing missing peaks if radicals are present in crude proton nmr spectra, for example?
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very common, yes. Can also give you an explanation if needed.
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methylene dioxy aryl singlet --> doublet of doublets with a J value of 1 Hz, so maybe this is just a RO-CHD-RO peak? I suspect radicals because I was working with this (http://www.sigmaaldrich.com/content/dam/sigma-aldrich/structure8/120/mfcd00005829.eps/_jcr_content/renditions/mfcd00005829-medium.png)
(http://i.imgur.com/CXqkGRv.png) (methylene dioxy peak)