scholarly journals Studies on the Proton Magnetic Resonance Spectra in Aromatic Systems, I. Discussions on the Para-disubstituted-, 1-Substituted-3, 4-Dimethoxy- and 1-Substituted-3, 4-Methylenedioxy Benzene Derivatives

1967 ◽  
Vol 15 (5) ◽  
pp. 599-607 ◽  
Author(s):  
Yoshio Sasaki ◽  
Miyoko Suzuki ◽  
Toshihiko Hibino ◽  
Kazuko Karai
Keyword(s):  
Magnetic Resonance ◽  
Proton Magnetic Resonance ◽  
Benzene Derivatives ◽  
Aromatic Systems ◽  
Magnetic Resonance Spectra

Benzene solvent induced shifts of the proton magnetic resonance spectra of some benzene derivatives. Importance of charge effects

1970 ◽  
Vol 48 (18) ◽  
pp. 2885-2895 ◽  
Author(s):  
R. Wasylishen ◽  
T. Schaefer ◽  
R. Schwenk
Keyword(s):  
Magnetic Resonance ◽  
Linear Correlation ◽  
Proton Magnetic Resonance ◽  
Steric Effects ◽  
Benzene Derivatives ◽  
Charge Effects ◽  
Solvent Shift ◽  
Solvent Shifts ◽  
Substituent Constants ◽  
Magnetic Resonance Spectra

The benzene solvent shifts of the proton magnetic resonance spectra of numerous polysubstituted benzene derivatives are measured with respect to cyclohexane as reference solvent. For many of these compounds, an additive scheme can be devised in which the effect of a substituent, X, on the solvent shift, Δ, of a proton is given by Δix so that Δ = Σx, Σi Δix where i = ortho, meta, or para. There is a linear correlation of Δmx or Δpx with Taft's substituent constants σm0 and σp0. It is suggested that charge effects are much more important than steric effects in determining both the magnitude and sign of Δ.

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