Thread: Can a chemist please help with NMR?
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Unread 09-06-2005, 03:01 PM
fucose_man fucose_man is offline
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Default Can a chemist please help with NMR?
Assuming you are in chloroform dthere are 4 aromatics. Starting ortho to the acid group and moving clockwise....1 H doublet 2 H doublet of doublets2 H doublet of doublets1 H doubletAll of these will be in the 6.8-7.6 range. There will probably be overlap unless you are at 300 MHz or higher.The phenol proton will be shifted much higher than phenols normally do. This is because it H-bonds to the carboyxlic acid carbonyl, causing it to go out to about 10-11 ppm.The acid peak will be broad and in the 12-14 range.Keep in mind exchangeable protons (phenol/acid/alcohols etc)can vary greatly depending on solvent, concentration, etc.

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