This will result in production of a magnetic field, which will reinforces the strength of the external magnetic field applied to the analyte. In aromatic compounds, the electrons are delocalised below and above the ring, due to the resonance structures. The chemical shifts for these compounds range between 6-7 ppm but lets take closer a look at what is causing this effect. One of the most important chemical shifts to be noted, is the one for the aromatic compounds such as benzene. Type of ProtonĪs you can see from the table above, the more electronegative atoms, attached to the carbon, bonded to the proton of the interest, will de-shield the hydrogen and therefore the more downfield the peak will be.
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