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From the NMR spectroscopy organic chemistry lab: Are the effects on chemical shifts of attached electronegative...

From the NMR spectroscopy organic chemistry lab: Are the effects on chemical shifts of attached electronegative atoms additive? Explain.
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yes electronegative effect the chemical shift

suppose take the two examples CH3 attached to carbon, CH3 attached to oxygen, CH3 attached to F

CH3-C, CH3-O, CH3-F

1.0ppm 3.3 ppm 4.2 ppm

though all are CH3 groups these but these are having different chemical shift values when it attached to different electronegitive atoms

principal involved in this electro-ve atom withdraw the electrons towards itself so it will creat less electron density around the CH3 compare to its expected so resulted diamagnitism (secondar magnetic field) generatred around theCH3 will decrease then less shilding will be there so more chemical shift value

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