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NMR 14


77 ppm is a value worth remembering, since CDCl3 is a common solvent. It also has a distinctive pattern of three small equal peaks, and is sometime used as a reference instead of TMS.

While the peaks are in the order we would expect from induction effects, this pattern is not always the case:


The relative shielding of a gamma carbon - relative to an electronegative functional group, is apparently a common pattern in carbon NMR. I haven't yet learnt an explanation for it.

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