The Proton Chemical Shift of Styrene

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Proton chemical shifts in nuclear magnetic resonance spectra of styrene were semi-empirically evaluated by considering the following effects: (i) The π-ring current effect, (ii) the magnetic anisotropy effect of neighboring carbon atoms, (iii) the local diamagnetic shielding of the hydrogen atom, and (iv) the partial ring current effect.<BR>Calculated values are −0.40 ppm and −0.82 ppm for β- and α-protons, respectively, referred to the proton trans to the phenyl group and the observed values are −0.50 ppm and −1.50 ppm, respectively.

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