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Nmr table of chemical shifts
Its electronegativity is pulling electrons away from the methyl groups - and this tends to increase the chemical shift slightly. The approximations are perfectly good, and we will work from this table:. In the table, the "R" groups won't necessarily be simple alkyl groups. Dynamic NMR. Crews, J. That means that you will need a smaller external magnetic field to bring the nucleus into the resonance condition than if it was attached to less electronegative things. They are both due to a single carbon atom in the molecule, and yet they have different heights.