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« How to deal with ambiguity in an HMBC spectrum? … Part 3 | Main | IR, NMR and MS of a Sulfonyl Chloride compound »

July 28, 2008


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Djalma Menezes de Oliveira

Dear Arvin,

I am a student in Brazil. I use ACDLabs and I am a fan of you Blog. Then, I have a question.

In an HMBC experiment (see image file) of a very small sample of isorhamnetin-3-O-glucoside was only observed a single sign of the correlation between the hydrogens of the methoxyl group (s,4.05) and carbon C-3 '(148.29). How can I explain this?
Thank you in advance.
Best Regards
Djalma Menezes de Oliveira
Natural Products Researcher
Phytochemistry area
Blog: http://fracionamento-silicagel.blogspot.com/


Hello Djalma,

Thank you for taking an interest in the blog P2C2E.

Based on your HMBC data, I suspect the correlation at 4.06/148 ppm is a result of 3J(H-C) coupling.

HMBC Interpretation: http://acdlabs.typepad.com/elucidation/2008/07/interpreting-a.html



Sir,I am having H,C,HMBC,HSQC spectra of a compound isolated from a plant.Would you able to interpret the spectra.with regards,Deepa,

Mohd yasin

Sir,I am having H,C,HMBC,HSQC spectral data of a molecule isolated from a bacteria.Would you please help to interpret the spectra.with regards


Hello Mohd,

At ACD/Labs, we offer a paid service for solving unknowns at http://www.acdlabs.com/products/com_iden/elucidation/struc_eluc/challenge.php.



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