Chemical Forums
Chemistry Forums for Students => Organic Chemistry Forum => Organic Spectroscopy => Topic started by: nehorlavazapalka on October 28, 2013, 02:39:13 PM
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I've got two purine derivatives. One has isopropyl substituent placed at 3, while the other has isopropyl at 9.
How do I get to differentiate between them using NMR? The atoms should be eqivalent and the only thing I can think of is to use simulation software to compare the shifts, but the results are rather ambiguous.
I have 1H, 13C, COSY, HMBC and HMQC available (both compounds), though I do not understand the differences that should be there (other than different shift values).
Thank you very much for answers.
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Can you discriminate between the two purine C-H protons by 1H NMR?
What C-H correlations does HMBC provide?