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C nmr table values
Using the simplified table of chemical shifts above, work out the structure of the compound with the following C NMR spectrum. Most organic functional groups give signal from ppm. This is the left-hand methyl group in the molecule. We can see in the table that sp 3 hybridized C — H bonds in alkanes and cycloalkanes give signal in the upfield region shielded, low resonance frequency at the range of 1—2 ppm. The effect of electron-withdrawing groups on the chemical shift can be visualized by the image below:. Without thinking, it is tempting to go for the R 2 C H 2 with peaks in the 16 - 25 region. This puts the proton in a shielded environment and thus it feels a weaker magnetic field:.