Proton N.M.R.-spectroscopic studies of substituted aromatic compounds

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Abstract
Para-hydrogen chemical shifts in a series of monosubstituted benzene derivatives have been shown to depend linearly on the π-electron density variations on the adjacent carbon atom calculated by a non-empirical Hückel LCAO method. Attention is drawn to the fact that important modifications of ring-current intensity occur when a substituent is introduced in the benzene molecule.