One of the greatest advantages of 13 C-NMR compared to 1 H-NMR is the breadth of the spectrum – recall that carbons resonate from 0-220 ppm relative to the TMS standard, as opposed to only 0-12 ppm for protons. Because of this, 13 C signals rarely overlap, and we can almost always distinguish separate peaks for each carbon, even in a relatively large compound containing carbons in very similar.. 13.10 • 13 C NMR Spectroscopy: Signal Averaging and FT-NMR In some ways, it’s surprising that carbon NMR is even possible. After all, 12 C, the most abundant carbon isotope, has no nuclear spin and can’t be seen by NMR. Carbon-13 is the only naturally occurring carbon isotope with a nuclear spin, but its natural abundance is only 1.1%.
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B18OA1 13 C NMR Spectroscopy 2 Typical chemical shifts 13 C NMR chemical shifts fall roughly into two regions, above and below 100 ppm: sp 2 carbons to the left, sp 3 to the right. • Aliphatic (sp 3-hybridised) carbons give rise to a signal in the 0 − 50 ppm region; substitution with an electronegative atom (O, N, Cl, F) can shift the signal downfield to about 80 ppm.. The 13 C NMR spectrum for 3-buten-2-one is: Using the table above, you can assign each peak to each carbon. The peak at just under 200 ppm is due to a carbon-oxygen double bond. The two peaks at 137 ppm and 129 ppm are due to the carbons at either end of the carbon-carbon double bond.
