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NMR 4

One of the most deshielded protons found in organic molecules is an aldehyde protons, at shifts of 9 to 10 ppm:


The resonance is 1 or 2 ppm higher for carboxylic acids, due to this resonance form:


If the solution is concentrated enough for hydrogen bonding to take place, it will deshield these hydrogens even further:

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