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C nmr spectra table
Theory and Chemical Applications," E. And the peak at 26 is the methyl group which, of course, is joined to the rest of the molecule by a carbon-carbon single bond. Remember that each peak identifies a carbon atom in a different environment within the molecule. Crews, J. Remember, the most abundant natural isotope of carbon is the 12 C which, having an even number of protons and neutrons is not magnetically active and cannot be used in NMR. The relatively low value of the carbon-oxygen double bond peak suggests an ester or acid rather than an aldehyde or ketone. Iodine demonstrates what is called the Heavy-Atom-Effect.