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Peaks c nmr chart
The carbon in the CH 3 group is attached to 3 hydrogens and a carbon. This puts the proton in a shielded environment and thus it feels a weaker magnetic field:. The carbons we are interested in are the ones in the methyl group, not in the R groups. No table can account for all the fine differences in environment of a carbon in a molecule. Your examiners should give you shift values which exactly match the compound you are given. The carbon-oxygen double bond in the peak for the ketone group has a slightly lower value than the table suggests for a ketone.